84.4% is the change from 391 to 721
Calculation steps:
[( 721 - 391 ) ÷ 391] x 100 = 84.4%
Formula
Percentage change = [(721 - 391) / 391] x 100
Subtract the new number by the original number
721 - 391 = 330
330 ÷ 391 = 0.8439897698209718
0.8439897698209718 x 100 = 84.4%