-54.74% is the change from 685 to 310
Calculation steps:
[( 310 - 685 ) ÷ 685] x 100 = -54.74%
Formula
Percentage change = [(310 - 685) / 685] x 100
Subtract the new number by the original number
310 - 685 = -375
-375 ÷ 685 = -0.5474452554744526
-0.5474452554744526 x 100 = -54.74%