340% is the change from 125 to 550
Calculation steps:
[( 550 - 125 ) ÷ 125] x 100 = 340%
Formula
Percentage change = [(550 - 125) / 125] x 100
Subtract the new number by the original number
550 - 125 = 425
425 ÷ 125 = 3.4
3.4 x 100 = 340%
Example