-46.88% is the change from 128 to 68
Calculation steps:
[( 68 - 128 ) ÷ 128] x 100 = -46.88%
Formula
Percentage change = [(68 - 128) / 128] x 100
Subtract the new number by the original number
68 - 128 = -60
-60 ÷ 128 = -0.46875
-0.46875 x 100 = -46.88%