60.84% is the change from 309 to 497
Calculation steps:
[( 497 - 309 ) ÷ 309] x 100 = 60.84%
Formula
Percentage change = [(497 - 309) / 309] x 100
Subtract the new number by the original number
497 - 309 = 188
188 ÷ 309 = 0.6084142394822006
0.6084142394822006 x 100 = 60.84%