-40.74% is the change from 135 to 80
Calculation steps:
[( 80 - 135 ) ÷ 135] x 100 = -40.74%
Formula
Percentage change = [(80 - 135) / 135] x 100
Subtract the new number by the original number
80 - 135 = -55
-55 ÷ 135 = -0.4074074074074074
-0.4074074074074074 x 100 = -40.74%