109.74% is the change from 308 to 646
Calculation steps:
[( 646 - 308 ) ÷ 308] x 100 = 109.74%
Formula
Percentage change = [(646 - 308) / 308] x 100
Subtract the new number by the original number
646 - 308 = 338
338 ÷ 308 = 1.0974025974025974
1.0974025974025974 x 100 = 109.74%