303.33% is the change from 30 to 121
Calculation steps:
[( 121 - 30 ) ÷ 30] x 100 = 303.33%
Formula
Percentage change = [(121 - 30) / 30] x 100
Subtract the new number by the original number
121 - 30 = 91
91 ÷ 30 = 3.033333333333333
3.033333333333333 x 100 = 303.33%