28.39% is the change from 310 to 398
Calculation steps:
[( 398 - 310 ) ÷ 310] x 100 = 28.39%
Formula
Percentage change = [(398 - 310) / 310] x 100
Subtract the new number by the original number
398 - 310 = 88
88 ÷ 310 = 0.2838709677419355
0.2838709677419355 x 100 = 28.39%