-81.25% is the change from 800 to 150
Calculation steps:
[( 150 - 800 ) ÷ 800] x 100 = -81.25%
Formula
Percentage change = [(150 - 800) / 800] x 100
Subtract the new number by the original number
150 - 800 = -650
-650 ÷ 800 = -0.8125
-0.8125 x 100 = -81.25%