31.2% is the change from 391 to 513
Calculation steps:
[( 513 - 391 ) ÷ 391] x 100 = 31.2%
Formula
Percentage change = [(513 - 391) / 391] x 100
Subtract the new number by the original number
513 - 391 = 122
122 ÷ 391 = 0.31202046035805625
0.31202046035805625 x 100 = 31.2%