33.75% is the change from 397 to 531
Calculation steps:
[( 531 - 397 ) ÷ 397] x 100 = 33.75%
Formula
Percentage change = [(531 - 397) / 397] x 100
Subtract the new number by the original number
531 - 397 = 134
134 ÷ 397 = 0.33753148614609574
0.33753148614609574 x 100 = 33.75%