312.9% is the change from 124 to 512
Calculation steps:
[( 512 - 124 ) ÷ 124] x 100 = 312.9%
Formula
Percentage change = [(512 - 124) / 124] x 100
Subtract the new number by the original number
512 - 124 = 388
388 ÷ 124 = 3.129032258064516
3.129032258064516 x 100 = 312.9%