2 The Mathematics. of Finance. Copyright Cengage Learning. All rights reserved.


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1 2 The Mathematics of Finance Copyright Cengage Learning. All rights reserved.
2 2.3 Annuities, Loans, and Bonds Copyright Cengage Learning. All rights reserved.
3 Annuities, Loans, and Bonds A typical definedcontribution pension fund works as follows: Every month while you work, you and your employer deposit a certain amount of money in an account. This money earns (compound) interest from the time it is deposited. When you retire, the account continues to earn interest, but you may then start withdrawing money at a rate calculated to reduce the account to zero after some number of years. This account is an example of an annuity, an account earning interest into which you make periodic deposits or from which you make periodic withdrawals. 3
4 Annuities, Loans, and Bonds In common usage, the term annuity is used for an account from which you make withdrawals. There are various terms used for accounts into which you make payments, based on their purpose. Examples include savings account, pension fund, and sinking fund. A sinking fund is generally used by businesses or governments to accumulate money to pay off an anticipated debt, but we ll use the term to refer to any account into which you make periodic payments. 4
5 Sinking Funds 5
6 Sinking Funds Suppose you make a payment of $100 at the end of every month into an account earning 3.6% interest per year, compounded monthly. This means that your investment is earning 3.6%/12 = 0.3% per month. We write i = 0.036/12 = What will be the value of the investment at the end of 2 years (24 months)? Think of the deposits separately. Each earns interest from the time it is deposited, and the total accumulated after 2 years is the sum of these deposits and the interest they earn. 6
7 Sinking Funds In other words, the accumulated value is the sum of the future values of the deposits, taking into account how long each deposit sits in the account. Figure 1 shows a timeline with the deposits and the contribution of each to the final value. Figure 1 7
8 Sinking Funds For example, the very last deposit (at the end of month 24) has no time to earn interest, so it contributes only $100. The very first deposit, which earns interest for 23 months, by the future value formula for compound interest contributes $100( ) 23 to the total. Adding together all of the future values gives us the total future value: FV = ( ) + 100( ) ( ) 23 = 100[1 + ( ) + ( ) 2 + +( ) 23 ] 8
9 Sinking Funds Fortunately, this sort of sum is wellknown and there is a convenient formula for its value: In our case, with x = , this formula allows us to calculate the future value: It is now easy to generalize this calculation. 9
10 Sinking Funds Future Value of a Sinking Fund A sinking fund is an account earning compound interest into which you make periodic deposits. Suppose that the account has an annual rate of r compounded m times per year, so that i = r/m is the interest rate per compounding period. If you make a payment of PMT at the end of each period, then the future value after t years, or n = mt periods, will be 10
11 Sinking Funds Quick Example At the end of each month you deposit $50 into an account earning 2% annual interest compounded monthly. To find the future value after 5 years, we use i = 0.02/12 and n = 12 5 = 60 compounding periods, so 11
12 Example 1 Retirement Account Your retirement account has $5,000 in it and earns 5% interest per year compounded monthly. Every month for the next 10 years you will deposit $100 into the account. How much money will there be in the account at the end of those 10 years? Solution: This is a sinking fund with PMT = $100, r = 0.05, m = 12, so i = 0.05/12, and n = =
13 Example 1 Solution cont d Ignoring for the moment the $5,000 already in the account, your payments have the following future value: 13
14 Example 1 Solution cont d What about the $5,000 that was already in the account? That sits there and earns interest, so we need to find its future value as well, using the compound interest formula: FV = PV(1 + i ) n = 5,000( /12) 120 = $8, Hence, the total amount in the account at the end of 10 years will be $15, , = $23,
15 Sinking Funds Payment Formula for a Sinking Fund Suppose that an account has an annual rate of r compounded m times per year, so that i = r/m is the interest rate per compounding period. If you want to accumulate a total of FV in the account after t years, or n = mt periods, by making payments of PMT at the end of each period, then each payment must be 15
16 Annuities 16
17 Annuities Suppose we deposit an amount PV now in an account earning 3.6% interest per year, compounded monthly. Starting 1 month from now, the bank will send us monthly payments of $100. What must PV be so that the account will be drawn down to $0 in exactly 2 years? As before, we write i = r/m = 0.036/12 = 0.003, and we have PMT = 100. The first payment of $100 will be made 1 month from now, so its present value is 17
18 Annuities In other words, that much of the original PV goes toward funding the first payment. The second payment, 2 months from now, has a present value of That much of the original PV funds the second payment. 18
19 Annuities This continues for 2 years, at which point we receive the last payment, which has a present value of and that exhausts the account. 19
20 Annuities Figure 2 shows a timeline with the payments and the present value of each. Figure 2 20
21 Annuities Because PV must be the sum of these present values, we get PV = 100( ) ( ) ( ) 24 = 100[( ) 1 + ( ) ( ) 24 ]. We can again find a simpler formula for this sum: x 1 + x x n = (x n 1 + x n ) 21
22 Annuities So, in our case, or If we deposit $2, initially and the bank sends us $100 per month for 2 years, our account will be exhausted at the end of that time. 22
23 Annuities Generalizing, we get the following formula: Present Value of an Annuity An annuity is an account earning compound interest from which periodic withdrawals are made. Suppose that the account has an annual rate of r compounded m times per year, so that i = r/m is the interest rate per compounding period. Suppose also that the account starts with a balance of PV. 23
24 Annuities If you receive a payment of PMT at the end of each compounding period, and the account is down to $0 after t years, or n = mt periods, then Quick Example At the end of each month you want to withdraw $50 from an account earning 2% annual interest compounded monthly. 24
25 Annuities If you want the account to last for 5 years (60 compounding periods), it must have the following amount to begin with: Note If you make your withdrawals at the end of each compounding period, you have an ordinary annuity. If, instead, you make withdrawals at the beginning of each compounding period, you have an annuity due. 25
26 Annuities Because each payment occurs one period earlier, there is one less period in which to earn interest, hence the present value must be larger by a factor of (1 + i ) to fund each payment. So, the present value formula for an annuity due is 26
27 Annuities Payment Formula for an Ordinary Annuity Suppose that an account has an annual rate of r compounded m times per year, so that i = r/m is the interest rate per compounding period. Suppose also that the account starts with a balance of PV. If you want to receive a payment of PMT at the end of each compounding period, and the account is down to $0 after t years, or n = mt periods, then 27
28 Installment Loans 28
29 Installment Loans In a typical installment loan, such as a car loan or a home mortgage, we borrow an amount of money and then pay it back with interest by making fixed payments (usually every month) over some number of years. From the point of view of the lender, this is an annuity. Thus, loan calculations are identical to annuity calculations. 29
30 Example 6 Home Mortgages Marc and Mira are buying a house, and have taken out a 30year, $90,000 mortgage at 8% interest per year. What will their monthly payments be? Solution: From the bank s point of view, a mortgage is an annuity. In this case, the present value is PV = $90,000, r = 0.08, m = 12, and n = = 360. To find the payments, we use the payment formula: 30
31 Example 6 Solution cont d The word mortgage comes from the French for dead pledge. The process of paying off a loan is called amortizing the loan, meaning to kill the debt owed. 31
32 Bonds 32
33 Bonds Suppose that a corporation offers a 10year bond paying 6.5% with payments every 6 months. If we pay $10,000 for bonds with a maturity value of $10,000, we will receive 6.5/2 = 3.25% of $10,000, or $325, every 6 months for 10 years, at the end of which time the corporation will give us the original $10,000 back. But bonds are rarely sold at their maturity value. Rather, they are auctioned off and sold at a price the bond market determines they are worth. 33
34 Bonds For example, suppose that bond traders are looking for an investment that has a rate of return or yield of 7% rather than the stated 6.5% (sometimes called the coupon interest rate to distinguish it from the rate of return). How much would they be willing to pay for the bonds above with a maturity value of $10,000? Think of the bonds as an investment that will pay the owner $325 every 6 months for 10 years, and will pay an additional $10,000 on maturity at the end of the 10 years.. We can treat the $325 payments as if they come from an annuity and determine how much an investor would pay for such an annuity if it earned 7% compounded semiannually. 34
35 Bonds Separately, we determine the present value of an investment worth $10,000 ten years from now, if it earned 7% compounded semiannually. For the first calculation, we use the annuity present value formula, with i = 0.07/2 and n = 2 10 =
36 Bonds For the second calculation, we use the present value formula for compound interest: PV = 10,000( /2) 20 = $5, Thus, an investor looking for a 7% return will be willing to pay $4, for the semiannual payments of $325 and $5, for the $10,000 payment at the end of 10 years, for a total of $4, , = $9, for the $10,000 bond. 36
37 Example 8 Bonds Suppose that bond traders are looking for only a 6% yield on their investment. How much would they pay per $10,000 for the 10year bonds above, which have a coupon interest rate of 6.5% and pay interest every six months? Solution: We redo the calculation with r = For the annuity calculation we now get 37
38 Example 8 Solution cont d For the compound interest calculation we get PV = 10,000( /2) 20 = $5, Thus, traders would be willing to pay a total of $4, $5, = $10, for bonds with a maturity value of $10,
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