-48.78% is the change from 41 to 21
Calculation steps:
[( 21 - 41 ) ÷ 41] x 100 = -48.78%
Formula
Percentage change = [(21 - 41) / 41] x 100
Subtract the new number by the original number
21 - 41 = -20
-20 ÷ 41 = -0.4878048780487805
-0.4878048780487805 x 100 = -48.78%