# Percentage increase

What is the annual percentage increase in the city when the population has tripled in 20 years?

## Correct answer:

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

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

### Units of physical quantities:

### Grade of the word problem:

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