12.68% is the change from 639 to 720
Calculation steps:
[( 720 - 639 ) ÷ 639] x 100 = 12.68%
Formula
Percentage change = [(720 - 639) / 639] x 100
Subtract the new number by the original number
720 - 639 = 81
81 ÷ 639 = 0.1267605633802817
0.1267605633802817 x 100 = 12.68%