432.5% is the change from 120 to 639
Calculation steps:
[( 639 - 120 ) ÷ 120] x 100 = 432.5%
Formula
Percentage change = [(639 - 120) / 120] x 100
Subtract the new number by the original number
639 - 120 = 519
519 ÷ 120 = 4.325
4.325 x 100 = 432.5%
Example