9.51% is the change from 284 to 311
Calculation steps:
[( 311 - 284 ) ÷ 284] x 100 = 9.51%
Formula
Percentage change = [(311 - 284) / 284] x 100
Subtract the new number by the original number
311 - 284 = 27
27 ÷ 284 = 0.09507042253521127
0.09507042253521127 x 100 = 9.51%