Calculate percent increase and decrease and explain what the percent measures.
Find a percent decrease
Problem
A quantity decreases from \(80\) to \(60\). What is the percent decrease?
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What this problem is really about
Percent decrease measures the amount lost relative to the original eighty, not relative to the ending value. We’ll subtract the new amount from the original, divide that loss by eighty, and convert the ratio to a percent. The complementary percent that remains should carry the original amount to sixty and confirm the calculation.
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