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
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