15950% is the change from 4 to 642
Calculation steps:
[( 642 - 4 ) ÷ 4] x 100 = 15950%
Formula
Percentage change = [(642 - 4) / 4] x 100
Subtract the new number by the original number
642 - 4 = 638
638 ÷ 4 = 159.5
159.5 x 100 = 15950%
Example