108.44% is the change from 391 to 815
Calculation steps:
[( 815 - 391 ) ÷ 391] x 100 = 108.44%
Formula
Percentage change = [(815 - 391) / 391] x 100
Subtract the new number by the original number
815 - 391 = 424
424 ÷ 391 = 1.0843989769820972
1.0843989769820972 x 100 = 108.44%