.13(150)=19.5
Answer: 19.5
If you want 13% (this works for any percentage) move the decimal over two places to the left, then multiply the revised number and the number you want a percentage of.
Example:
Problem: 21% of 795
step1: 21% becomes .21
step2: multiply .21 and 795
The answer to the example problem would be: 166.95
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$150 - $112.50(75%) = $37.50
15 percent of $150 is $22.50.
30% off $150 = $150 - (0.30 x $150) = $105
13*20/100 = 2.60 dollars.
15% of $1000 is $150.