# MP3 player

Mary plans to buy a new MP3 player for 90 USD. And every month, the amount he saved in the previous month doubles. If she saves 3 USD in the first month, how many months will Mary save enough to buy an MP3 player?

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

**algebra**- exponential equation
- geometric progression
- expression of a variable from the formula
**arithmetic**- rounding
- exponentiation
**basic functions**- logarithm
- exponential function
**numbers**- fractions

#### Units of physical quantities:

#### Grade of the word problem:

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