The problem describes a sinking fund established to pay off a debt of $60,000 in 15 years. Deposits are made at the end of each 6-month period, and the interest rate is 6% compounded semiannually. We need to calculate the amount of each deposit.

Applied MathematicsFinancial MathematicsSinking FundCompound InterestFuture ValuePeriodic Payments
2025/4/11

1. Problem Description

The problem describes a sinking fund established to pay off a debt of $60,000 in 15 years. Deposits are made at the end of each 6-month period, and the interest rate is 6% compounded semiannually. We need to calculate the amount of each deposit.

2. Solution Steps

The formula for the periodic payment PP required to accumulate a future value FVFV with regular deposits is:
P=FVi(1+i)n1P = \frac{FV \cdot i}{(1+i)^n - 1}
Where:
FVFV = Future Value = $60,000
ii = interest rate per period = 6%2=0.03\frac{6\%}{2} = 0.03
nn = number of periods = 15 years×2=3015 \text{ years} \times 2 = 30
Plug in the values:
P=60000×0.03(1+0.03)301P = \frac{60000 \times 0.03}{(1+0.03)^{30} - 1}
P=1800(1.03)301P = \frac{1800}{(1.03)^{30} - 1}
P=18002.427262471P = \frac{1800}{2.42726247 - 1}
P=18001.42726247P = \frac{1800}{1.42726247}
P=1261.135P = 1261.135
Round to the nearest cent:
P=1261.14P = 1261.14

3. Final Answer

The amount of each deposit is $1261.14.

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