-52.84% is the change from 668 to 315
Calculation steps:
[( 315 - 668 ) ÷ 668] x 100 = -52.84%
Formula
Percentage change = [(315 - 668) / 668] x 100
Subtract the new number by the original number
315 - 668 = -353
-353 ÷ 668 = -0.5284431137724551
-0.5284431137724551 x 100 = -52.84%