55.02% is the change from 309 to 479
Calculation steps:
[( 479 - 309 ) ÷ 309] x 100 = 55.02%
Formula
Percentage change = [(479 - 309) / 309] x 100
Subtract the new number by the original number
479 - 309 = 170
170 ÷ 309 = 0.5501618122977346
0.5501618122977346 x 100 = 55.02%