81.59% is the change from 391 to 710
Calculation steps:
[( 710 - 391 ) ÷ 391] x 100 = 81.59%
Formula
Percentage change = [(710 - 391) / 391] x 100
Subtract the new number by the original number
710 - 391 = 319
319 ÷ 391 = 0.8158567774936062
0.8158567774936062 x 100 = 81.59%