-71.13% is the change from 800 to 231
Calculation steps:
[( 231 - 800 ) ÷ 800] x 100 = -71.13%
Formula
Percentage change = [(231 - 800) / 800] x 100
Subtract the new number by the original number
231 - 800 = -569
-569 ÷ 800 = -0.71125
-0.71125 x 100 = -71.13%