71.1% is the change from 391 to 669
Calculation steps:
[( 669 - 391 ) ÷ 391] x 100 = 71.1%
Formula
Percentage change = [(669 - 391) / 391] x 100
Subtract the new number by the original number
669 - 391 = 278
278 ÷ 391 = 0.710997442455243
0.710997442455243 x 100 = 71.1%