Calculate percent increase and decrease and explain what the percent measures.
Find a percent increase
Problem
A quantity increases from \(40\) to \(50\). What is the percent increase?
Big Picture
What this problem is really about
Percent increase compares how much the quantity grew with where it started, so forty—not fifty—is the base. We’ll subtract the original from the new amount, divide that increase by the original, and convert the ratio to a percent. Applying the resulting growth factor to forty should reproduce the new amount.
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