-89.86% is the change from 838 to 85
Calculation steps:
[( 85 - 838 ) ÷ 838] x 100 = -89.86%
Formula
Percentage change = [(85 - 838) / 838] x 100
Subtract the new number by the original number
85 - 838 = -753
-753 ÷ 838 = -0.8985680190930787
-0.8985680190930787 x 100 = -89.86%