-80.25% is the change from 800 to 158
Calculation steps:
[( 158 - 800 ) ÷ 800] x 100 = -80.25%
Formula
Percentage change = [(158 - 800) / 800] x 100
Subtract the new number by the original number
158 - 800 = -642
-642 ÷ 800 = -0.8025
-0.8025 x 100 = -80.25%