-82.72% is the change from 810 to 140
Calculation steps:
[( 140 - 810 ) ÷ 810] x 100 = -82.72%
Formula
Percentage change = [(140 - 810) / 810] x 100
Subtract the new number by the original number
140 - 810 = -670
-670 ÷ 810 = -0.8271604938271605
-0.8271604938271605 x 100 = -82.72%