62.18% is the change from 394 to 639
Calculation steps:
[( 639 - 394 ) ÷ 394] x 100 = 62.18%
Formula
Percentage change = [(639 - 394) / 394] x 100
Subtract the new number by the original number
639 - 394 = 245
245 ÷ 394 = 0.6218274111675127
0.6218274111675127 x 100 = 62.18%