# Basic financial arithmetic

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1 2 Basic financial arithmetic Simple interest Compound interest Nominal and effective rates Continuous discounting Conversions and comparisons Exercise Summary File: MFME2_02.xls 13

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3 This chapter deals with the basic concepts of financial mathematics from which investment analysis, bonds, leasing and many other elements arise. Companies and individuals face the problem of investing today in the hope of some financial gain or deferring expenditure. There is a risk in investing so companies expect a return for these risks. Similarly, investors require some extra return for investing in risky assets. This is the time preference of money as the basic financial theory, which depends on the following: 2 Basic financial arithmetic If companies and individuals think logically and rationally, they usually prefer money today rather than the promise of returns in the future. Money today is more certain than the promise of funds in the future. They can be said to be risk averse and require some sort of gain to give up the certainty of money today. Inflation affects the decision as it can quickly erode gains when translated into current purchasing power. This may not be significant in Europe at present; however, there have been recent periods where inflation has been in excess of 10 per cent. Some lending is more risky than other forms. Loan to governments can sometimes be considered risk-free and perhaps attract a lower risk premium than corporate lending. In theory, the risk premium should reflect the timescale and relative risk reflected such that the decision to delay provides a greater gain. Ratings agencies specialize in grading institutions and countries according to the perceived risk they represent. These three factors underpin the concepts of time value of money and discounted cash flows, which drive the financial concepts in this book. SIMPLE INTEREST The easiest interest rate to compute is a simple rate. Simple or flat rate interest charges a price for the principal and does not take account of the time value of money, and it is therefore a simplification of compounding covered later in this chapter. This method is calculated only on the principal and does not take into account the fact that interest can be calculated on interest. Nevertheless, simple interest is usually used for periods of less than a year and there is an array of market conventions for bills, deposits, bonds, etc. within the financial markets. The simple interest INT on an investment (or loan) of a present value (initial) amount at an annual interest rate of r for a period of t years is: INT = PV*r*t INT = interest PV = present value 15

4 Mastering Financial Mathematics in Microsoft Excel The future value (FV or maturity value) of a simple interest investment of PV dollars at an annual interest rate of r for a period of t years is: FV = PV + INT = PV (1 + rt) This is the amount that you would have at the end of the period. You can also solve for the present value PV to obtain: PV = FV / (1 + rt) PV = present value FV = future value These calculations can easily be translated into Excel as on the Simple Interest sheet. Figure 2.1 Example 1 Figure 2.1 shows the simple interest on 1,000,000 from 28 February to the next year in a leap year. Three conventions show the number of days and the standardized number of days in the year. The interest, future value and present value are calculated using the formulas above. Cell D12 uses the function DAYS360 to calculate the days between the dates on a 360-day basis. The above uses the US (NASD) method and the rules the function adopts are: 16 US (NASD) method: if the start date is the 31st of a month, it becomes equal to the 30th of the same month. If the end date is the 31st of a month and the start date is earlier than the 30th of a month, the end date becomes equal to the 1st of the next month; otherwise the end date becomes equal to the 30th of the same month.

5 2 Basic financial arithmetic Example 2 Figure 2.2 European method: start dates and end dates that occur on the 31st of a month become equal to the 30th of the same month. Cell E13 contains the formula for calculating the actual number of days in the year: =DATE(YEAR(C7)+1,MONTH(C7),DAY(C7))-DATE(YEAR(C7), MONTH(C7),DAY(C7)) This calculates one year from the start date with the DATE function and then subtracts the start date in the same format. Figure 2.2 shows the effect across a shorter period of three days, where the interest payable is different under all three methods. Here the gap between the two dates is two days, but it is calculated as three on a 30/360 day basis. The addition of the standard number of days in the year results in three different levels of interest based on the simple rate of 10 per cent. Simple interest could be used for calculating loan payments and is frequently used for hire purchase (US dollar out) or lease purchase contracts. These are often structured as transactions with deposits and the balance of payments over a period. Figure 2.3 shows a 1,000,000 loan with a 10 per cent deposit repayable over five years monthly at a simple interest rate of 10 per cent. The net advance is 900,000 after the 10 per cent deposit. The annual interest is 90,000 at 10 per cent so the total interest payable is 450,000. The total payable is 1,350,000 after the deposit, which can be divided by 60 monthly payments. The monthly rental is 22,500 and the total payable with the deposit 1,450,000. Notice that the total payable does not 17

6 Mastering Financial Mathematics in Microsoft Excel Figure 2.3 Simple loan interest vary as you select monthly, quarterly, semi-annual or annual payments. This is because the method does not recognize the effect of time value of money. Cell C10 is validated using a data list in the range B29:B32 (see Figure 2.4). Figure 2.4 Lookup functions The MATCH function in cell D29 finds the index position on the period selection in the inputs. The OFFSET function turns the index number back into the selected periodicity and number of payments per annum. 18

7 2 Basic financial arithmetic COMPOUND INTEREST Compound interest takes into account the time value of money of investments. Compounding means that interest is calculated not only on the initial investment but also on the interest of previous periods. Time value of money calculations underpin many applications in finance such as investment analysis, bonds, options, etc. and can be: single cash flow time value of money; multiple cash flow or discounted cash flow. The interest rate is made up of three components: Risk-free rate this is a rate that investors could invest funds at no or little risk. Typically this is a 10-year government bond as a proxy to a risk-free rate. Risk premium this is a rate above the risk-free rate that investors demand as compensation for losing the use of the money today and potentially investing in more risky assets than government bonds at the risk-free rate. Inflation premium inflation eats away at real returns and again investors need compensation for the loss of purchasing power. In the previous section, the amount payable was the same irrespective of the payment period; however, compounding would lead to different results owing to the intervals between payments. The terminology often used in these calculations is: N number of periodic payments I periodic interest PV present value or capital value PMT periodic payment FV future value It is often useful to draw time lines of problems to understand the timing of cash flow or alternatively to draw a grid of the known and unknown parameters. Figure 2.5 shows a present value of 1,000. The annual nominal interest rate is 14 per cent and with quarterly payments the periodic rate is 3.5 per cent per period. As with all financial modelling, the cash flow notation is used: cash out is negative and cash in is positive. 19

8 Mastering Financial Mathematics in Microsoft Excel Figure 2.5 Time line This is a specimen grid showing the known and unknown parameters as an alternative to a time line. Item Inputs Notes N 12 Payment Interval 3 Quarterly rentals INT 14% PV 1000 PMT? No of Rents at Start 1 FV 0 Advance/Arrears 1 1 = Advance, 0 = Arrears Future value The future value is the amount to which a deposit will grow over time with compound interest. The formula is: Future value = FV = PV (1 + I/Y) N I/Y = periodic interest rate N = number of compounding periods Figure 2.6 uses the formula and the FV function. A negative present value produces a positive future value: FV = 1000* ( %) ^ 12 = 1,

9 2 Basic financial arithmetic Future value Figure 2.6 Present value The future value formula can be restated to calculate the present value of a single future value (see Figure 2.7, page 21). This is discounting the future cash flow back to today s value: Present value = PV = FV / (1 + I/Y) N The example shows present values 1, back over 12 periods at a rate of 3.5 per cent per period. The answer is, of course, 1,000. The example spreadsheet uses both the formula and the PV function to derive the answer (see Figure 2.8, page 21). Other variables The full formula for solving other variables is 0 = PV + (1 + is) PMT 1 (1 + i) [ n ] + FV (1 + i) n i where S = payment toggle denoting whether payments are made at the beginning or the end of each period. It makes a difference whether you receive the payments at the beginning or the end of a period. I = periodic interest rate 21

10 Mastering Financial Mathematics in Microsoft Excel Figure 2.7 Present value Figure 2.8 PV Function While the number of payments, payment or interest rate can be calculated manually, it is simpler to use the built-in functions in Excel. These are: NPER number of payments RATE periodic interest rate PMT periodic payment 22

11 2 Basic financial arithmetic TVM calculator Figure 2.9 The cells E5:E12 in Figure 2.9 indicate the inputs at the top as a loan of 1,000 over 12 periods quarterly in advance with no future value. The model works out the periodic interest and the answer section uses conditional IF statements to show an answer solely for the zero variable in the inputs section. The five formulas are: =NPER(PeriodicIntRate,Payment,Present_ value,future_value,payment_toggle) =RATE(Number_of_payments,Payment,Present_value, Future_value,Payment_Toggle)*100*(12/Payment_ Frequency) the rate has to be multiplied back to an annual rate =PV(PeriodicIntRate,Number_of_payments,Payment, Future_value,Payment_Toggle) =PMT(PeriodicIntRate,Number_of_payments,Present_ value,future_value,payment_toggle) =FV(PeriodicIntRate,Number_of_payments,Payment, Present_value,Payment_Toggle) The answer is shown as The model is set up to calculate any fifth variable when four are input. For example, the payment is only 90 so what 23

12 Mastering Financial Mathematics in Microsoft Excel is the future value left unamortized over the period? Twelve payments of are not enough to write off the loan at an interest rate of 3.5 per cent per quarterly period (14 per cent per annum). Since there are answers above, no answers are calculated in cells B19:B22. The future value is calculated as (see Figure 2.10). As a further example, you could calculate the number of periods needed to write off 1,000 at per period (see Figure 2.11). This is not an integer number of payments with the answer as Therefore the calculator is flexible since the initial formula must hold. If you change the payment and all other variables remain the same, solving for the number of payments will produce the number of payments required to write off the loan. Figure 2.10 Future value calculation NOMINAL AND EFFECTIVE RATES The interest rates above are nominal or stated annual interest rates. This means that a rate of 3.5 per cent with quarterly payments is quoted as 14 per cent, i.e. 3.5 per cent multiplied by four payments per annum. The rate of return that is actually paid or charged depends on the number of compounding periods in the year and this is the effective or effective annual 24

13 2 Basic financial arithmetic Number of periods calculation Figure 2.11 rate (EAR). Adjustments have to be made for the number of compounding periods so the rate will vary between monthly, quarterly, semi-annual and annual payments. The formula to migrate from a nominal to an effective rate is: [ ( 1 + Nominal / C ) ^ C ] 1 where C is the number of compounding periods. The formula to determine a nominal rate from an effective rate is: (1 + (Effective) ^ (1 / C) 1) * C. The example below uses 14 per cent as a nominal rate and calculates the effective rates and back again. The example in Figure 2.12 of 14 per cent with quarterly periods is: Formula = [(1 + 14%/4) ^ 4] 1 = % Excel has built-in functions for interest rate conversions such as EFFECT and NOMINAL and these are shown on the sheet (see Figure 2.13). Note that the Analysis ToolPak has to be installed for these functions to be available. The inputs are the rate and the number of periods and the function calculates the result without the need for a formula. You can test the model by working backwards and forwards. Annual effective and nominal rates will always be the same since there is only one period in the year. 25

14 Mastering Financial Mathematics in Microsoft Excel Figure 2.12 Nominal and effective Figure 2.13 Effect function CONTINUOUS DISCOUNTING You can apply interest over smaller and smaller periods until it becomes continuous rather than discrete (see Figure 2.14). The mathematical relationship is: Formula : (1 + effective rate) = e ^nominal rate 26

15 2 Basic financial arithmetic Continuous discounting Figure 2.14 e= Euler s constant of , the base of natural logarithms, is gained by using the function EXP in Excel with the argument 1. This constant is the inverse of LN, the natural logarithm of a number. The continuous effective rate for 14 per cent is per cent, which compares with the monthly rate of 14.9 per cent using the EFFECT function. This method of compounding arises in option pricing and is an option on most financial calculators. CONVERSIONS AND COMPARISONS It is important to understand the cash flows since it can be misleading to look at cash flows over different time periods. The example in Figure 2.15 compares a quarterly transaction with payments at the beginning of the period against a monthly transaction with payments at the end of the respective periods. In each case, the nominal rate is 14 per cent and the PMT function is used to calculate the regular payment from N, I, PV, FV together with the periods per annum and the advance/arrears switch. The simple interest rate is calculated based on the charges and the true period. This is 11 quarters in the first case and 36 months in the second case (rentals are in arrears). The simple interest rate is higher for the quarterly transaction since the periodicity is not taken into account. The effective rate is higher for the monthly option since there are 12 compounding periods against four. 27

16 Mastering Financial Mathematics in Microsoft Excel Figure 2.15 Comparison EXERCISE A loan of 100,000 is payable over five years with monthly payments of 60,000 commencing one month after the inception date. The loan repayment is 2,000 per month and the nominal rate 10 per cent. How much capital remains at the end of five years? If the future value is 5,000 what does the loan payment need to be? Build a spreadsheet using the functions demonstrated in this chapter. SUMMARY This chapter reviews basic building blocks of simple, nominal and effective rates with simple annuity cash flows and shows how these can be calculated simply in Excel using basic functions such as PV, RATE and NPER. Interest rates can be easily converted using functions such as EFFECT and NOMINAL. 28

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