-81.82% is the change from 220 to 40
Calculation steps:
[( 40 - 220 ) ÷ 220] x 100 = -81.82%
Formula
Percentage change = [(40 - 220) / 220] x 100
Subtract the new number by the original number
40 - 220 = -180
-180 ÷ 220 = -0.8181818181818182
-0.8181818181818182 x 100 = -81.82%