-63.64% is the change from 220 to 80
Calculation steps:
[( 80 - 220 ) ÷ 220] x 100 = -63.64%
Formula
Percentage change = [(80 - 220) / 220] x 100
Subtract the new number by the original number
80 - 220 = -140
-140 ÷ 220 = -0.6363636363636364
-0.6363636363636364 x 100 = -63.64%