156.63% is the change from 249 to 639
Calculation steps:
[( 639 - 249 ) ÷ 249] x 100 = 156.63%
Formula
Percentage change = [(639 - 249) / 249] x 100
Subtract the new number by the original number
639 - 249 = 390
390 ÷ 249 = 1.5662650602409638
1.5662650602409638 x 100 = 156.63%