-87.5% is the change from 128 to 16
Calculation steps:
[( 16 - 128 ) ÷ 128] x 100 = -87.5%
Formula
Percentage change = [(16 - 128) / 128] x 100
Subtract the new number by the original number
16 - 128 = -112
-112 ÷ 128 = -0.875
-0.875 x 100 = -87.5%
Example