308.13% is the change from 123 to 502
Calculation steps:
[( 502 - 123 ) ÷ 123] x 100 = 308.13%
Formula
Percentage change = [(502 - 123) / 123] x 100
Subtract the new number by the original number
502 - 123 = 379
379 ÷ 123 = 3.0813008130081303
3.0813008130081303 x 100 = 308.13%