-22.5% is the change from 80 to 62
Calculation steps:
[( 62 - 80 ) ÷ 80] x 100 = -22.5%
Formula
Percentage change = [(62 - 80) / 80] x 100
Subtract the new number by the original number
62 - 80 = -18
-18 ÷ 80 = -0.225
-0.225 x 100 = -22.5%
Example