315.45% is the change from 123 to 511
Calculation steps:
[( 511 - 123 ) ÷ 123] x 100 = 315.45%
Formula
Percentage change = [(511 - 123) / 123] x 100
Subtract the new number by the original number
511 - 123 = 388
388 ÷ 123 = 3.154471544715447
3.154471544715447 x 100 = 315.45%