318.7% is the change from 123 to 515
Calculation steps:
[( 515 - 123 ) ÷ 123] x 100 = 318.7%
Formula
Percentage change = [(515 - 123) / 123] x 100
Subtract the new number by the original number
515 - 123 = 392
392 ÷ 123 = 3.186991869918699
3.186991869918699 x 100 = 318.7%