-79.63% is the change from 800 to 163
Calculation steps:
[( 163 - 800 ) ÷ 800] x 100 = -79.63%
Formula
Percentage change = [(163 - 800) / 800] x 100
Subtract the new number by the original number
163 - 800 = -637
-637 ÷ 800 = -0.79625
-0.79625 x 100 = -79.63%