9.74% is the change from 308 to 338
Calculation steps:
[( 338 - 308 ) ÷ 308] x 100 = 9.74%
Formula
Percentage change = [(338 - 308) / 308] x 100
Subtract the new number by the original number
338 - 308 = 30
30 ÷ 308 = 0.09740259740259741
0.09740259740259741 x 100 = 9.74%