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'is' over 'of' equals percentage over 100

ex. 45 percent of 842 is what?

answer. x/842 = 45%/100

cross multiply 45 times 842 -you get 37890

then divide that by 100 and your answer is 378.9

378.9 is 45% of 842

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Q: How do you figure out what percent of what number is x?
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