108.02% is the change from 399 to 830
Calculation steps:
[( 830 - 399 ) ÷ 399] x 100 = 108.02%
Formula
Percentage change = [(830 - 399) / 399] x 100
Subtract the new number by the original number
830 - 399 = 431
431 ÷ 399 = 1.0802005012531328
1.0802005012531328 x 100 = 108.02%