15875% is the change from 4 to 639
Calculation steps:
[( 639 - 4 ) ÷ 4] x 100 = 15875%
Formula
Percentage change = [(639 - 4) / 4] x 100
Subtract the new number by the original number
639 - 4 = 635
635 ÷ 4 = 158.75
158.75 x 100 = 15875%
Example