56.31% is the change from 309 to 483
Calculation steps:
[( 483 - 309 ) ÷ 309] x 100 = 56.31%
Formula
Percentage change = [(483 - 309) / 309] x 100
Subtract the new number by the original number
483 - 309 = 174
174 ÷ 309 = 0.5631067961165048
0.5631067961165048 x 100 = 56.31%