29.16% is the change from 391 to 505
Calculation steps:
[( 505 - 391 ) ÷ 391] x 100 = 29.16%
Formula
Percentage change = [(505 - 391) / 391] x 100
Subtract the new number by the original number
505 - 391 = 114
114 ÷ 391 = 0.2915601023017903
0.2915601023017903 x 100 = 29.16%