-98.75% is the change from 800 to 10
Calculation steps:
[( 10 - 800 ) ÷ 800] x 100 = -98.75%
Formula
Percentage change = [(10 - 800) / 800] x 100
Subtract the new number by the original number
10 - 800 = -790
-790 ÷ 800 = -0.9875
-0.9875 x 100 = -98.75%