306.45% is the change from 124 to 504
Calculation steps:
[( 504 - 124 ) ÷ 124] x 100 = 306.45%
Formula
Percentage change = [(504 - 124) / 124] x 100
Subtract the new number by the original number
504 - 124 = 380
380 ÷ 124 = 3.064516129032258
3.064516129032258 x 100 = 306.45%