36.15% is the change from 390 to 531
Calculation steps:
[( 531 - 390 ) ÷ 390] x 100 = 36.15%
Formula
Percentage change = [(531 - 390) / 390] x 100
Subtract the new number by the original number
531 - 390 = 141
141 ÷ 390 = 0.36153846153846153
0.36153846153846153 x 100 = 36.15%