-49.52% is the change from 624 to 315
Calculation steps:
[( 315 - 624 ) ÷ 624] x 100 = -49.52%
Formula
Percentage change = [(315 - 624) / 624] x 100
Subtract the new number by the original number
315 - 624 = -309
-309 ÷ 624 = -0.4951923076923077
-0.4951923076923077 x 100 = -49.52%