-67.19% is the change from 128 to 42
Calculation steps:
[( 42 - 128 ) ÷ 128] x 100 = -67.19%
Formula
Percentage change = [(42 - 128) / 128] x 100
Subtract the new number by the original number
42 - 128 = -86
-86 ÷ 128 = -0.671875
-0.671875 x 100 = -67.19%