Math Problem Statement

Nicole invested $29,000 in an account paying an interest rate of 5 ¼ % compounded continuously. Bentley invested $29,000 in an account paying an interest rate of 4 ⅝ % compounded annually. After 14 years, how much more money would Nicole have in her account than Bentley, to the nearest dollar?

Solution

Let's break down the problem from your DeltaMath question:

We have two investments:

  1. Nicole's Investment:

    • Principal: $29,000
    • Interest Rate: 5 ¼ % = 5.25% (as a decimal, 0.0525)
    • Compounded continuously
    • Time: 14 years

    For continuous compounding, we use the formula: A=PertA = P \cdot e^{rt} where AA is the amount, PP is the principal, rr is the interest rate, and tt is the time in years. ee is the base of the natural logarithm (approximately 2.718).

  2. Bentley's Investment:

    • Principal: $29,000
    • Interest Rate: 4 ⅝ % = 4.625% (as a decimal, 0.04625)
    • Compounded annually
    • Time: 14 years

    For annual compounding, we use the formula: A=P(1+rn)ntA = P \left(1 + \frac{r}{n}\right)^{nt} where n=1n = 1 since it is compounded annually.

Let me calculate how much each person has after 14 years and find the difference.After 14 years:

  • Nicole's account grows to approximately $60,479.
  • Bentley's account grows to approximately $54,613.

The difference in favor of Nicole is approximately $5,866.

Would you like further details or have any questions?

Here are some related questions for further practice:

  1. How would the result change if Bentley’s interest was compounded quarterly instead of annually?
  2. What would happen if both accounts were compounded semi-annually?
  3. How does continuous compounding differ from annual compounding in general?
  4. How would an increase in the investment amount affect the total after 14 years?
  5. What would the final amount be for both Nicole and Bentley after 20 years instead of 14?

Tip: Continuous compounding typically leads to higher returns compared to annual compounding, especially over longer periods.

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Math Problem Analysis

Mathematical Concepts

Exponential Growth
Continuous Compounding
Annual Compounding

Formulas

Continuous Compounding: A = P * e^(rt)
Annual Compounding: A = P * (1 + r/n)^(nt)

Theorems

Exponential growth model

Suitable Grade Level

High School