-73.02% is the change from 315 to 85
Calculation steps:
[( 85 - 315 ) ÷ 315] x 100 = -73.02%
Formula
Percentage change = [(85 - 315) / 315] x 100
Subtract the new number by the original number
85 - 315 = -230
-230 ÷ 315 = -0.7301587301587301
-0.7301587301587301 x 100 = -73.02%