The simplest method to calculate a percent change is to subtract the original number from the new number, and then divide that difference by the original number and multiply by 100 to get a percent. For example, a change from 5 to 6 has a difference of 1, divided by the original 5 is 0.2, which is a 20 percent change when multiplied by 100.
Continue ReadingA second method is to divide the new number by the old number, multiply by 100, and then subtract 100. For the increase from 5 to 6, dividing 6 by 5 yields 1.2, which is 120 percent. Subtracting 100 yields the correct answer of a 20 percent increase.
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