-81.13% is the change from 212 to 40
Calculation steps:
[( 40 - 212 ) ÷ 212] x 100 = -81.13%
Formula
Percentage change = [(40 - 212) / 212] x 100
Subtract the new number by the original number
40 - 212 = -172
-172 ÷ 212 = -0.8113207547169812
-0.8113207547169812 x 100 = -81.13%