The fastest way to take 20 percent off a number is to multiply the original number by 0.8
20% of 30 is 6.
30 - 6 = 24
30 x 0.8 = 24
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Since the number will lose 20% of its value, 80% of it will remain. 80% = 0.8 Multiply the number by 0.8 . The result is what remains after the number shrinks by 20%.
14.36just subtract the percent (20) from 100put that number into decimal form (.80)multiply that decimal and your original number (17.95)17.95 X .8 = 14.36works every time :P
10% of 20 = 2, 20-2 = 18
You have to turn the percentage into a decimal.
Multiply the original number by 0.9