304% is the change from 125 to 505
Calculation steps:
[( 505 - 125 ) ÷ 125] x 100 = 304%
Formula
Percentage change = [(505 - 125) / 125] x 100
Subtract the new number by the original number
505 - 125 = 380
380 ÷ 125 = 3.04
3.04 x 100 = 304%
Example