313.82% is the change from 123 to 509
Calculation steps:
[( 509 - 123 ) ÷ 123] x 100 = 313.82%
Formula
Percentage change = [(509 - 123) / 123] x 100
Subtract the new number by the original number
509 - 123 = 386
386 ÷ 123 = 3.138211382113821
3.138211382113821 x 100 = 313.82%