104.26% is the change from 399 to 815
Calculation steps:
[( 815 - 399 ) ÷ 399] x 100 = 104.26%
Formula
Percentage change = [(815 - 399) / 399] x 100
Subtract the new number by the original number
815 - 399 = 416
416 ÷ 399 = 1.0426065162907268
1.0426065162907268 x 100 = 104.26%