338.38% is the change from 99 to 434
Calculation steps:
[( 434 - 99 ) ÷ 99] x 100 = 338.38%
Formula
Percentage change = [(434 - 99) / 99] x 100
Subtract the new number by the original number
434 - 99 = 335
335 ÷ 99 = 3.3838383838383836
3.3838383838383836 x 100 = 338.38%