30.94% is the change from 488 to 639
Calculation steps:
[( 639 - 488 ) ÷ 488] x 100 = 30.94%
Formula
Percentage change = [(639 - 488) / 488] x 100
Subtract the new number by the original number
639 - 488 = 151
151 ÷ 488 = 0.3094262295081967
0.3094262295081967 x 100 = 30.94%