-49.63% is the change from 135 to 68
Calculation steps:
[( 68 - 135 ) ÷ 135] x 100 = -49.63%
Formula
Percentage change = [(68 - 135) / 135] x 100
Subtract the new number by the original number
68 - 135 = -67
-67 ÷ 135 = -0.4962962962962963
-0.4962962962962963 x 100 = -49.63%