-89.99% is the change from 849 to 85
Calculation steps:
[( 85 - 849 ) ÷ 849] x 100 = -89.99%
Formula
Percentage change = [(85 - 849) / 849] x 100
Subtract the new number by the original number
85 - 849 = -764
-764 ÷ 849 = -0.8998822143698468
-0.8998822143698468 x 100 = -89.99%