-50% is the change from 82 to 41
Calculation steps:
[( 41 - 82 ) ÷ 82] x 100 = -50%
Formula
Percentage change = [(41 - 82) / 82] x 100
Subtract the new number by the original number
41 - 82 = -41
-41 ÷ 82 = -0.5
-0.5 x 100 = -50%
Example