-91.24% is the change from 970 to 85
Calculation steps:
[( 85 - 970 ) ÷ 970] x 100 = -91.24%
Formula
Percentage change = [(85 - 970) / 970] x 100
Subtract the new number by the original number
85 - 970 = -885
-885 ÷ 970 = -0.9123711340206185
-0.9123711340206185 x 100 = -91.24%