Question

A fund quotes annual force of interest as follows. Year 1 2 3 8t 5% 12% 10% 9% A deposit of K accumulates to 2400 over 4 year

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Answer #1

What is K?

Answer: 1,702.098

Workings

Yearend Value = year Beginning Value + Interest

Interest = Year Beginning Value * interest rate for that year

With help of the above formula we can find the value of year beginning balance.

Year

Yearend value

Interest rate

Calculation

Year beginning balance (K)

4

2400

9%

K+ k*9% =2400

1.09 K = 2400

K = 2400/1.09

2,201.834

3

2,201.834

10%

K+ k*10% =2201.834

1.10 K = 2201.834

K = 2201.834/1.10

2,001.667

2

2,001.667

12%

K+ k*12% =2001.667

1.12 K = 2001.667

K = 2001.667/1.12

1,787.203

1

1,787.203

5%

K+ k*5% =1787.203

1.05 K = 1787.203

K = 1787.203/1.05

1,702.098

Explanation for the calculation

4th year

If we invest amount K at the beginning of the year 4 at the interest rate of 9% we will get 2400

I.e.       K + K * 9% = 2400

            K + .09K = 2400

            1.09K = 2400

            K =2400 / 1.09

            K = 2,201.834 (year end balance of year 3 / year beginning value for year 4)

Accordingly we can find out the value for each year.

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