-12.5% is the change from 32 to 28
Calculation steps:
[( 28 - 32 ) ÷ 32] x 100 = -12.5%
Formula
Percentage change = [(28 - 32) / 32] x 100
Subtract the new number by the original number
28 - 32 = -4
-4 ÷ 32 = -0.125
-0.125 x 100 = -12.5%
Example