102.01% is the change from 399 to 806
Calculation steps:
[( 806 - 399 ) ÷ 399] x 100 = 102.01%
Formula
Percentage change = [(806 - 399) / 399] x 100
Subtract the new number by the original number
806 - 399 = 407
407 ÷ 399 = 1.0200501253132832
1.0200501253132832 x 100 = 102.01%