-88.93% is the change from 840 to 93
Calculation steps:
[( 93 - 840 ) ÷ 840] x 100 = -88.93%
Formula
Percentage change = [(93 - 840) / 840] x 100
Subtract the new number by the original number
93 - 840 = -747
-747 ÷ 840 = -0.8892857142857142
-0.8892857142857142 x 100 = -88.93%