7.79% is the change from 231 to 249
Calculation steps:
[( 249 - 231 ) ÷ 231] x 100 = 7.79%
Formula
Percentage change = [(249 - 231) / 231] x 100
Subtract the new number by the original number
249 - 231 = 18
18 ÷ 231 = 0.07792207792207792
0.07792207792207792 x 100 = 7.79%