330% is the change from 30 to 129
Calculation steps:
[( 129 - 30 ) ÷ 30] x 100 = 330%
Formula
Percentage change = [(129 - 30) / 30] x 100
Subtract the new number by the original number
129 - 30 = 99
99 ÷ 30 = 3.3
3.3 x 100 = 330%
Example