99.27% is the change from 409 to 815
Calculation steps:
[( 815 - 409 ) ÷ 409] x 100 = 99.27%
Formula
Percentage change = [(815 - 409) / 409] x 100
Subtract the new number by the original number
815 - 409 = 406
406 ÷ 409 = 0.9926650366748166
0.9926650366748166 x 100 = 99.27%