-41.18% is the change from 136 to 80
Calculation steps:
[( 80 - 136 ) ÷ 136] x 100 = -41.18%
Formula
Percentage change = [(80 - 136) / 136] x 100
Subtract the new number by the original number
80 - 136 = -56
-56 ÷ 136 = -0.4117647058823529
-0.4117647058823529 x 100 = -41.18%