-79.5% is the change from 800 to 164
Calculation steps:
[( 164 - 800 ) ÷ 800] x 100 = -79.5%
Formula
Percentage change = [(164 - 800) / 800] x 100
Subtract the new number by the original number
164 - 800 = -636
-636 ÷ 800 = -0.795
-0.795 x 100 = -79.5%