103.56% is the change from 309 to 629
Calculation steps:
[( 629 - 309 ) ÷ 309] x 100 = 103.56%
Formula
Percentage change = [(629 - 309) / 309] x 100
Subtract the new number by the original number
629 - 309 = 320
320 ÷ 309 = 1.035598705501618
1.035598705501618 x 100 = 103.56%