8.44% is the change from 391 to 424
Calculation steps:
[( 424 - 391 ) ÷ 391] x 100 = 8.44%
Formula
Percentage change = [(424 - 391) / 391] x 100
Subtract the new number by the original number
424 - 391 = 33
33 ÷ 391 = 0.08439897698209718
0.08439897698209718 x 100 = 8.44%