-51.22% is the change from 41 to 20
Calculation steps:
[( 20 - 41 ) ÷ 41] x 100 = -51.22%
Formula
Percentage change = [(20 - 41) / 41] x 100
Subtract the new number by the original number
20 - 41 = -21
-21 ÷ 41 = -0.5121951219512195
-0.5121951219512195 x 100 = -51.22%