-75.78% is the change from 128 to 31
Calculation steps:
[( 31 - 128 ) ÷ 128] x 100 = -75.78%
Formula
Percentage change = [(31 - 128) / 128] x 100
Subtract the new number by the original number
31 - 128 = -97
-97 ÷ 128 = -0.7578125
-0.7578125 x 100 = -75.78%