310.48% is the change from 124 to 509
Calculation steps:
[( 509 - 124 ) ÷ 124] x 100 = 310.48%
Formula
Percentage change = [(509 - 124) / 124] x 100
Subtract the new number by the original number
509 - 124 = 385
385 ÷ 124 = 3.1048387096774195
3.1048387096774195 x 100 = 310.48%