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2015-05-12T19:09:47+08:00

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We are looking for the base so the formula for the base is:
Base= \frac{Percentage}{Rate} = \frac{25}{0.1} =250

We converted 10% to a decimal which is 0.1. A rate is the number with the percentage sign (%). A base is the number which usually has the keyword "of" before it.
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