28.62% is the change from 304 to 391
Calculation steps:
[( 391 - 304 ) ÷ 304] x 100 = 28.62%
Formula
Percentage change = [(391 - 304) / 304] x 100
Subtract the new number by the original number
391 - 304 = 87
87 ÷ 304 = 0.28618421052631576
0.28618421052631576 x 100 = 28.62%