109.39% is the change from 309 to 647
Calculation steps:
[( 647 - 309 ) ÷ 309] x 100 = 109.39%
Formula
Percentage change = [(647 - 309) / 309] x 100
Subtract the new number by the original number
647 - 309 = 338
338 ÷ 309 = 1.0938511326860842
1.0938511326860842 x 100 = 109.39%