108.54% is the change from 398 to 830
Calculation steps:
[( 830 - 398 ) ÷ 398] x 100 = 108.54%
Formula
Percentage change = [(830 - 398) / 398] x 100
Subtract the new number by the original number
830 - 398 = 432
432 ÷ 398 = 1.085427135678392
1.085427135678392 x 100 = 108.54%