64.27% is the change from 389 to 639
Calculation steps:
[( 639 - 389 ) ÷ 389] x 100 = 64.27%
Formula
Percentage change = [(639 - 389) / 389] x 100
Subtract the new number by the original number
639 - 389 = 250
250 ÷ 389 = 0.6426735218508998
0.6426735218508998 x 100 = 64.27%