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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(4 × 5) + (4 × 6) + (4 × 6) + 1/2 (4 × 6) + 1/2 (4 × 6)
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