-76.56% is the change from 128 to 30
Calculation steps:
[( 30 - 128 ) ÷ 128] x 100 = -76.56%
Formula
Percentage change = [(30 - 128) / 128] x 100
Subtract the new number by the original number
30 - 128 = -98
-98 ÷ 128 = -0.765625
-0.765625 x 100 = -76.56%