-50.96% is the change from 624 to 306
Calculation steps:
[( 306 - 624 ) ÷ 624] x 100 = -50.96%
Formula
Percentage change = [(306 - 624) / 624] x 100
Subtract the new number by the original number
306 - 624 = -318
-318 ÷ 624 = -0.5096153846153846
-0.5096153846153846 x 100 = -50.96%