63.01% is the change from 392 to 639
Calculation steps:
[( 639 - 392 ) ÷ 392] x 100 = 63.01%
Formula
Percentage change = [(639 - 392) / 392] x 100
Subtract the new number by the original number
639 - 392 = 247
247 ÷ 392 = 0.6301020408163265
0.6301020408163265 x 100 = 63.01%