306.4% is the change from 125 to 508
Calculation steps:
[( 508 - 125 ) ÷ 125] x 100 = 306.4%
Formula
Percentage change = [(508 - 125) / 125] x 100
Subtract the new number by the original number
508 - 125 = 383
383 ÷ 125 = 3.064
3.064 x 100 = 306.4%
Example