103.76% is the change from 399 to 813
Calculation steps:
[( 813 - 399 ) ÷ 399] x 100 = 103.76%
Formula
Percentage change = [(813 - 399) / 399] x 100
Subtract the new number by the original number
813 - 399 = 414
414 ÷ 399 = 1.037593984962406
1.037593984962406 x 100 = 103.76%