-87.28% is the change from 778 to 99
Calculation steps:
[( 99 - 778 ) ÷ 778] x 100 = -87.28%
Formula
Percentage change = [(99 - 778) / 778] x 100
Subtract the new number by the original number
99 - 778 = -679
-679 ÷ 778 = -0.8727506426735219
-0.8727506426735219 x 100 = -87.28%