-90.91% is the change from 935 to 85
Calculation steps:
[( 85 - 935 ) ÷ 935] x 100 = -90.91%
Formula
Percentage change = [(85 - 935) / 935] x 100
Subtract the new number by the original number
85 - 935 = -850
-850 ÷ 935 = -0.9090909090909091
-0.9090909090909091 x 100 = -90.91%