A sinking fund is established to discharge a debt of $60,000 in 15 years. Deposits are made at the end of each 6-month period, and interest is paid at a rate of 6%, compounded semiannually. We need to find the amount of each deposit.

Applied MathematicsFinancial MathematicsSinking FundCompound InterestFuture Value
2025/4/11

1. Problem Description

A sinking fund is established to discharge a debt of $60,000 in 15 years. Deposits are made at the end of each 6-month period, and interest is paid at a rate of 6%, compounded semiannually. We need to find the amount of each deposit.

2. Solution Steps

The formula for the payment PMTPMT of a sinking fund is:
PMT=FVi(1+i)n1PMT = \frac{FV \cdot i}{(1 + i)^n - 1}
Where:
FVFV is the future value (the amount to be accumulated).
ii is the interest rate per period.
nn is the number of periods.
In this problem, we have:
FV=FV = 60,000$
The interest rate is 6% per year, compounded semiannually. So, the interest rate per period is i=6%2=0.03i = \frac{6\%}{2} = 0.03.
The time period is 15 years, and deposits are made semiannually. So, the number of periods is n=15×2=30n = 15 \times 2 = 30.
Plugging these values into the formula, we get:
PMT=600000.03(1+0.03)301PMT = \frac{60000 \cdot 0.03}{(1 + 0.03)^{30} - 1}
PMT=1800(1.03)301PMT = \frac{1800}{(1.03)^{30} - 1}
PMT=18002.427261PMT = \frac{1800}{2.42726 - 1}
PMT=18001.42726PMT = \frac{1800}{1.42726}
PMT1261.101PMT \approx 1261.101
Rounding to the nearest cent, we get $1261.
1
0.

3. Final Answer

$1261.10

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