9.89% is the change from 283 to 311
Calculation steps:
[( 311 - 283 ) ÷ 283] x 100 = 9.89%
Formula
Percentage change = [(311 - 283) / 283] x 100
Subtract the new number by the original number
311 - 283 = 28
28 ÷ 283 = 0.0989399293286219
0.0989399293286219 x 100 = 9.89%