-99.13% is the change from 800 to 7
Calculation steps:
[( 7 - 800 ) ÷ 800] x 100 = -99.13%
Formula
Percentage change = [(7 - 800) / 800] x 100
Subtract the new number by the original number
7 - 800 = -793
-793 ÷ 800 = -0.99125
-0.99125 x 100 = -99.13%