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.
Solution
To solve this problem, we need to use the formula for compound interest. The formula for compound interest is:
Where:
- is the amount of money accumulated after n years, including interest.
- is the principal amount (the initial amount of money).
- is the annual interest rate (decimal).
- is the number of times that interest is compounded per year.
- is the time the money is invested for in years.
Given:
- dollars
- (2% annual interest rate)
- (compounded monthly)
- years
First, we need to convert the annual interest rate to a monthly interest rate by dividing by 12:
Next, we substitute the values into the compound interest formula:
Calculate the exponent:
Now, calculate the base:
Raise the base to the power of 60:
Finally, multiply by the principal amount:
So, the final value after 5 years, with interest compounded monthly, is approximately $3314.14.
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