-99.1% is the change from 778 to 7
Calculation steps:
[( 7 - 778 ) ÷ 778] x 100 = -99.1%
Formula
Percentage change = [(7 - 778) / 778] x 100
Subtract the new number by the original number
7 - 778 = -771
-771 ÷ 778 = -0.9910025706940874
-0.9910025706940874 x 100 = -99.1%