-89.52% is the change from 840 to 88
Calculation steps:
[( 88 - 840 ) ÷ 840] x 100 = -89.52%
Formula
Percentage change = [(88 - 840) / 840] x 100
Subtract the new number by the original number
88 - 840 = -752
-752 ÷ 840 = -0.8952380952380953
-0.8952380952380953 x 100 = -89.52%