30.74% is the change from 231 to 302
Calculation steps:
[( 302 - 231 ) ÷ 231] x 100 = 30.74%
Formula
Percentage change = [(302 - 231) / 231] x 100
Subtract the new number by the original number
302 - 231 = 71
71 ÷ 231 = 0.30735930735930733
0.30735930735930733 x 100 = 30.74%