-12.5% is the change from 88 to 77
Calculation steps:
[( 77 - 88 ) ÷ 88] x 100 = -12.5%
Formula
Percentage change = [(77 - 88) / 88] x 100
Subtract the new number by the original number
77 - 88 = -11
-11 ÷ 88 = -0.125
-0.125 x 100 = -12.5%
Example