7% of 100 is 7. Extrapolate. 100 is 1/4 of 400, so 7 times 4 is 28. hence 28 is the answer.
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To find 15 percent of 400 dollars, you would first convert 15 percent to a decimal by dividing it by 100, which gives you 0.15. Then, you multiply 0.15 by 400 to calculate the answer. This gives you 60 dollars, which is 15 percent of 400 dollars.
400 dollars 2000 x .20 = 400
$12
70% of $400 = 70% x $400 = 0.70 x $400 = $280
$4. one percent = 1/100 hence $400 x 0.01 = $4