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One way you could do this is multiply 40 by 30% which is the same as 40 x .3. I do it a faster way though. I take 10% of 40, which is 4 since you move the decimal point once to the right. Then I multiply 4 by 3 to get the correct answer of 12.

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15y ago

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Q: 30 percent of 40 is what?
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