# The sum 41

The sum of 640.00 was deposited in the first bank for five years, and the interest given was 160.00. Find the rate.

## Correct answer:

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### You need to know the following knowledge to solve this word math problem:

**algebra**- equation
- exponential equation
- expression of a variable from the formula
**arithmetic**- exponentiation
**basic functions**- percentages
- exponential function

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