-55.56% is the change from 81 to 36
Calculation steps:
[( 36 - 81 ) ÷ 81] x 100 = -55.56%
Formula
Percentage change = [(36 - 81) / 81] x 100
Subtract the new number by the original number
36 - 81 = -45
-45 ÷ 81 = -0.5555555555555556
-0.5555555555555556 x 100 = -55.56%