Jean has $280 in her savings account. Starting next week, she will deposit $30 in her account every week. Is the amount of money in her account proportional to the number of weeks?

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No, it is not proportional. For example, after 1 week she would have 280+30=310. After 2 weeks she would have 310+30=340. proportional time is 2 to 1, but proportional savings is 340 to 310, which is a different proportion. But the additional amount is proportional, because 2 to 1 is the same proportion as 60 to 30.

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