343.8% is the change from 121 to 537
Calculation steps:
[( 537 - 121 ) ÷ 121] x 100 = 343.8%
Formula
Percentage change = [(537 - 121) / 121] x 100
Subtract the new number by the original number
537 - 121 = 416
416 ÷ 121 = 3.43801652892562
3.43801652892562 x 100 = 343.8%