-82% is the change from 850 to 153
Calculation steps:
[( 153 - 850 ) ÷ 850] x 100 = -82%
Formula
Percentage change = [(153 - 850) / 850] x 100
Subtract the new number by the original number
153 - 850 = -697
-697 ÷ 850 = -0.82
-0.82 x 100 = -82%
Example