-73.78% is the change from 839 to 220
Calculation steps:
[( 220 - 839 ) ÷ 839] x 100 = -73.78%
Formula
Percentage change = [(220 - 839) / 839] x 100
Subtract the new number by the original number
220 - 839 = -619
-619 ÷ 839 = -0.7377830750893921
-0.7377830750893921 x 100 = -73.78%