106.13% is the change from 310 to 639
Calculation steps:
[( 639 - 310 ) ÷ 310] x 100 = 106.13%
Formula
Percentage change = [(639 - 310) / 310] x 100
Subtract the new number by the original number
639 - 310 = 329
329 ÷ 310 = 1.0612903225806452
1.0612903225806452 x 100 = 106.13%