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To work this in your head, make conversions. Twenty percent is 20/100 or .2 and ninety percent is 90/100 or .9, so if we want to multiply, we simply take 2 times 9 and get 18. But we need to account for the two decimal places in the original problem (the .2 and the .9). Move the decimal two places to the left, and 18 becomes .18, so the answer to twenty percent of ninety percent can be found by fairly simple arithmetic.

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14y ago

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