Math Problem Statement

Suppose that ​$60 comma 000 is invested at 5​% interest. Find the amount of money in the account after 8 years if the interest is compounded annually.

Solution

To solve the problem of finding the amount of money in an account after 8 years with compound interest, we can use the compound interest formula:

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

Where:

  • AA is the amount of money in the account after interest,
  • PP is the principal amount (initial investment),
  • rr is the annual interest rate (as a decimal),
  • nn is the number of times the interest is compounded per year,
  • tt is the number of years.

Given:

  • P=60,000P = 60,000,
  • r=5%=0.05r = 5\% = 0.05,
  • n=1n = 1 (compounded annually),
  • t=8t = 8 years.

Substitute the values into the formula:

A=60,000(1+0.051)1×8A = 60,000 \left(1 + \frac{0.05}{1}\right)^{1 \times 8}

Simplifying the equation:

A=60,000(1.05)8A = 60,000 \left(1.05\right)^8

Now calculate:

A=60,000×(1.477455)A = 60,000 \times (1.477455)

A88,647.30A \approx 88,647.30

Thus, the amount of money in the account after 8 years is approximately $88,647.30.

Would you like more details or have any questions about this calculation?

Here are some related questions you might explore:

  1. What if the interest was compounded quarterly instead of annually?
  2. How would the final amount change if the interest rate was 6% instead of 5%?
  3. What would be the amount after 10 years instead of 8?
  4. How much interest was earned over the 8 years?
  5. What is the formula for continuous compound interest?

Tip: The more frequently interest is compounded, the higher the final amount will be.

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Math Problem Analysis

Mathematical Concepts

Compound Interest
Exponential Growth

Formulas

Compound Interest Formula: A = P(1 + r/n)^(nt)

Theorems

Compound Interest Theorem

Suitable Grade Level

Grades 9-12