-82.5% is the change from 800 to 140
Calculation steps:
[( 140 - 800 ) ÷ 800] x 100 = -82.5%
Formula
Percentage change = [(140 - 800) / 800] x 100
Subtract the new number by the original number
140 - 800 = -660
-660 ÷ 800 = -0.825
-0.825 x 100 = -82.5%