Essay

Explaining Continuous Compound Interest Rate Calculation to a Client

You are working as a customer service representative at a local credit union. A member comes to your desk wanting to understand how the credit union calculates the required interest rate for a long-term goal. Specifically, they have 10,000 that they want to invest, and they need it to grow continuously to 150,000 over a period of 29 years.

To help them understand the math, write an explanation that outlines the following:

  1. State the formula used for continuous compound interest and define what each variable (AA, PP, rr, and tt) represents in the context of the member's investment.
  2. Substitute the member's values (10,000, 150,000, and 29) into the formula.
  3. List the mathematical operations required, step-by-step, to isolate and solve for the rate rr, including how to eliminate the base ee using logarithms.
  4. Show the final solved equation for rr and state the approximate required rate as a percentage.

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Updated 2026-06-03

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