-91.55% is the change from 840 to 71
Calculation steps:
[( 71 - 840 ) ÷ 840] x 100 = -91.55%
Formula
Percentage change = [(71 - 840) / 840] x 100
Subtract the new number by the original number
71 - 840 = -769
-769 ÷ 840 = -0.9154761904761904
-0.9154761904761904 x 100 = -91.55%