-85.78% is the change from 851 to 121
Calculation steps:
[( 121 - 851 ) ÷ 851] x 100 = -85.78%
Formula
Percentage change = [(121 - 851) / 851] x 100
Subtract the new number by the original number
121 - 851 = -730
-730 ÷ 851 = -0.8578143360752056
-0.8578143360752056 x 100 = -85.78%