48.8% is the change from 209 to 311
Calculation steps:
[( 311 - 209 ) ÷ 209] x 100 = 48.8%
Formula
Percentage change = [(311 - 209) / 209] x 100
Subtract the new number by the original number
311 - 209 = 102
102 ÷ 209 = 0.4880382775119617
0.4880382775119617 x 100 = 48.8%