108.82% is the change from 306 to 639
Calculation steps:
[( 639 - 306 ) ÷ 306] x 100 = 108.82%
Formula
Percentage change = [(639 - 306) / 306] x 100
Subtract the new number by the original number
639 - 306 = 333
333 ÷ 306 = 1.088235294117647
1.088235294117647 x 100 = 108.82%