109.23% is the change from 390 to 816
Calculation steps:
[( 816 - 390 ) ÷ 390] x 100 = 109.23%
Formula
Percentage change = [(816 - 390) / 390] x 100
Subtract the new number by the original number
816 - 390 = 426
426 ÷ 390 = 1.0923076923076922
1.0923076923076922 x 100 = 109.23%