-31.25% is the change from 128 to 88
Calculation steps:
[( 88 - 128 ) ÷ 128] x 100 = -31.25%
Formula
Percentage change = [(88 - 128) / 128] x 100
Subtract the new number by the original number
88 - 128 = -40
-40 ÷ 128 = -0.3125
-0.3125 x 100 = -31.25%