354.55% is the change from 121 to 550
Calculation steps:
[( 550 - 121 ) ÷ 121] x 100 = 354.55%
Formula
Percentage change = [(550 - 121) / 121] x 100
Subtract the new number by the original number
550 - 121 = 429
429 ÷ 121 = 3.5454545454545454
3.5454545454545454 x 100 = 354.55%