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Peta has worked in his current job for a small while now and has settled into a comfortable steady income. With this in mind, Peta wants to alter his retirement deposit details by increasing the compounding rate of his account. Peta originally put a set amount of money into the account and has not put anymore in since. The account is currently at $3000 and his current interest rate is 2% compounding annually. If the interest rate changes to 2% compounding monthly, calculate the final value after 5 years. Write appropriate units with your answer and round your answer to the nearest cent.

Question

Peta has worked in his current job for a small while now and has settled into a comfortable steady income. With this in mind, Peta wants to alter his retirement deposit details by increasing the compounding rate of his account.

Peta originally put a set amount of money into the account and has not put anymore in since. The account is currently at $3000 and his current interest rate is 2% compounding annually.

If the interest rate changes to

2% compounding monthly, calculate the final value after 5 years.

Write appropriate units with your answer and round your answer to the nearest cent.

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Solution

To solve this problem, we need to use the formula for compound interest. The formula for compound interest is:

A=P(1+rn)nt A = P \left(1 + \frac{r}{n}\right)^{nt}

Where:

  • A A is the amount of money accumulated after n years, including interest.
  • P P is the principal amount (the initial amount of money).
  • r r is the annual interest rate (decimal).
  • n n is the number of times that interest is compounded per year.
  • t t is the time the money is invested for in years.

Given:

  • P=3000 P = 3000 dollars
  • r=0.02 r = 0.02 (2% annual interest rate)
  • n=12 n = 12 (compounded monthly)
  • t=5 t = 5 years

First, we need to convert the annual interest rate to a monthly interest rate by dividing by 12:

rn=0.02120.0016667 \frac{r}{n} = \frac{0.02}{12} \approx 0.0016667

Next, we substitute the values into the compound interest formula:

A=3000(1+0.0016667)12×5 A = 3000 \left(1 + 0.0016667\right)^{12 \times 5}

Calculate the exponent:

12×5=60 12 \times 5 = 60

Now, calculate the base:

1+0.0016667=1.0016667 1 + 0.0016667 = 1.0016667

Raise the base to the power of 60:

1.0016667601.104713 1.0016667^{60} \approx 1.104713

Finally, multiply by the principal amount:

A=3000×1.1047133314.14 A = 3000 \times 1.104713 \approx 3314.14

So, the final value after 5 years, with interest compounded monthly, is approximately $3314.14.

This problem has been solved

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