-62.5% is the change from 128 to 48
Calculation steps:
[( 48 - 128 ) ÷ 128] x 100 = -62.5%
Formula
Percentage change = [(48 - 128) / 128] x 100
Subtract the new number by the original number
48 - 128 = -80
-80 ÷ 128 = -0.625
-0.625 x 100 = -62.5%
Example