50.08% is the change from 639 to 959
Calculation steps:
[( 959 - 639 ) ÷ 639] x 100 = 50.08%
Formula
Percentage change = [(959 - 639) / 639] x 100
Subtract the new number by the original number
959 - 639 = 320
320 ÷ 639 = 0.5007824726134585
0.5007824726134585 x 100 = 50.08%