Percent of decrease
Just like the name suggests, the percent of decrease is the amount of decrease out of one hundred.
Thus, the formula to use is : Amount of decrease / Original amount
I will illustrate what I just said with examples.
Find the percent of decrease from 6 to 4.
Amount of decrease is 6 − 4 = 2
Original amount is 6
2 / 6 = 0.3333
multiply 0.3333 by one hundred to get the answer as a percent.
0.3333 × 100 = 33.33, so the answer is 33.33%.
Find the amount of decrease per hundred from 10 to 5.
Amount of decrease is 10 − 5 = 5
Original amount is 10
5 / 10 = 0.50
multiply 0.50 by one hundred to get the answer as a percent
0.50 × 100 = 50, so the answer is 50%.
Find the amount of increase per hundred from -4 to -8.
Amount of decrease is -4 − -8 = -4 + 8 = 4
Original amount is -4
4 / -4 = -1
multiply -1 by one hundred to get the answer as a percent
-1 × 100 = -100, so the answer is -100%.
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