-83.33% is the change from 840 to 140
Calculation steps:
[( 140 - 840 ) ÷ 840] x 100 = -83.33%
Formula
Percentage change = [(140 - 840) / 840] x 100
Subtract the new number by the original number
140 - 840 = -700
-700 ÷ 840 = -0.8333333333333334
-0.8333333333333334 x 100 = -83.33%