82.1% is the change from 391 to 712
Calculation steps:
[( 712 - 391 ) ÷ 391] x 100 = 82.1%
Formula
Percentage change = [(712 - 391) / 391] x 100
Subtract the new number by the original number
712 - 391 = 321
321 ÷ 391 = 0.8209718670076727
0.8209718670076727 x 100 = 82.1%