33.5% is the change from 391 to 522
Calculation steps:
[( 522 - 391 ) ÷ 391] x 100 = 33.5%
Formula
Percentage change = [(522 - 391) / 391] x 100
Subtract the new number by the original number
522 - 391 = 131
131 ÷ 391 = 0.3350383631713555
0.3350383631713555 x 100 = 33.5%