-71.9% is the change from 840 to 236
Calculation steps:
[( 236 - 840 ) ÷ 840] x 100 = -71.9%
Formula
Percentage change = [(236 - 840) / 840] x 100
Subtract the new number by the original number
236 - 840 = -604
-604 ÷ 840 = -0.719047619047619
-0.719047619047619 x 100 = -71.9%