309.09% is the change from 121 to 495
Calculation steps:
[( 495 - 121 ) ÷ 121] x 100 = 309.09%
Formula
Percentage change = [(495 - 121) / 121] x 100
Subtract the new number by the original number
495 - 121 = 374
374 ÷ 121 = 3.090909090909091
3.090909090909091 x 100 = 309.09%