-61.73% is the change from 810 to 310
Calculation steps:
[( 310 - 810 ) ÷ 810] x 100 = -61.73%
Formula
Percentage change = [(310 - 810) / 810] x 100
Subtract the new number by the original number
310 - 810 = -500
-500 ÷ 810 = -0.6172839506172839
-0.6172839506172839 x 100 = -61.73%