35.81% is the change from 391 to 531
Calculation steps:
[( 531 - 391 ) ÷ 391] x 100 = 35.81%
Formula
Percentage change = [(531 - 391) / 391] x 100
Subtract the new number by the original number
531 - 391 = 140
140 ÷ 391 = 0.35805626598465473
0.35805626598465473 x 100 = 35.81%