334.17% is the change from 120 to 521
Calculation steps:
[( 521 - 120 ) ÷ 120] x 100 = 334.17%
Formula
Percentage change = [(521 - 120) / 120] x 100
Subtract the new number by the original number
521 - 120 = 401
401 ÷ 120 = 3.341666666666667
3.341666666666667 x 100 = 334.17%