-61.11% is the change from 810 to 315
Calculation steps:
[( 315 - 810 ) ÷ 810] x 100 = -61.11%
Formula
Percentage change = [(315 - 810) / 810] x 100
Subtract the new number by the original number
315 - 810 = -495
-495 ÷ 810 = -0.6111111111111112
-0.6111111111111112 x 100 = -61.11%