-89.84% is the change from 128 to 13
Calculation steps:
[( 13 - 128 ) ÷ 128] x 100 = -89.84%
Formula
Percentage change = [(13 - 128) / 128] x 100
Subtract the new number by the original number
13 - 128 = -115
-115 ÷ 128 = -0.8984375
-0.8984375 x 100 = -89.84%