-73.81% is the change from 840 to 220
Calculation steps:
[( 220 - 840 ) ÷ 840] x 100 = -73.81%
Formula
Percentage change = [(220 - 840) / 840] x 100
Subtract the new number by the original number
220 - 840 = -620
-620 ÷ 840 = -0.7380952380952381
-0.7380952380952381 x 100 = -73.81%