108.7% is the change from 391 to 816
Calculation steps:
[( 816 - 391 ) ÷ 391] x 100 = 108.7%
Formula
Percentage change = [(816 - 391) / 391] x 100
Subtract the new number by the original number
816 - 391 = 425
425 ÷ 391 = 1.0869565217391304
1.0869565217391304 x 100 = 108.7%