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Do you mean how to turn a percent to a decimal? If you do then all you have to do to change a percent to a decimal is divide by 100 or an easier way drop the % sign and move the decimal point 2 places to the left of the number
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Percent of change = amount of error/actual value * 100

A percent of change is a ratio that compares the change in quantity to the original amount.

Equation:
percent of change = final amount – original amount/original amount

Ex: 9.25 – 6.50/9.25 * 100
= 2.75/9.25 * 100
= .29729729722973 * 100
= 29.7 % decrease

Ex: 7.5 – 4/ 7.5 * 100
= 3.5/4 * 100
= 0.875 * 100
= 87.5 % increase

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