27.56% is the change from 312 to 398
Calculation steps:
[( 398 - 312 ) ÷ 312] x 100 = 27.56%
Formula
Percentage change = [(398 - 312) / 312] x 100
Subtract the new number by the original number
398 - 312 = 86
86 ÷ 312 = 0.27564102564102566
0.27564102564102566 x 100 = 27.56%