-87.19% is the change from 773 to 99
Calculation steps:
[( 99 - 773 ) ÷ 773] x 100 = -87.19%
Formula
Percentage change = [(99 - 773) / 773] x 100
Subtract the new number by the original number
99 - 773 = -674
-674 ÷ 773 = -0.871927554980595
-0.871927554980595 x 100 = -87.19%