-78.81% is the change from 840 to 178
Calculation steps:
[( 178 - 840 ) ÷ 840] x 100 = -78.81%
Formula
Percentage change = [(178 - 840) / 840] x 100
Subtract the new number by the original number
178 - 840 = -662
-662 ÷ 840 = -0.7880952380952381
-0.7880952380952381 x 100 = -78.81%