330.58% is the change from 121 to 521
Calculation steps:
[( 521 - 121 ) ÷ 121] x 100 = 330.58%
Formula
Percentage change = [(521 - 121) / 121] x 100
Subtract the new number by the original number
521 - 121 = 400
400 ÷ 121 = 3.3057851239669422
3.3057851239669422 x 100 = 330.58%