4180% is the change from 15 to 642
Calculation steps:
[( 642 - 15 ) ÷ 15] x 100 = 4180%
Formula
Percentage change = [(642 - 15) / 15] x 100
Subtract the new number by the original number
642 - 15 = 627
627 ÷ 15 = 41.8
41.8 x 100 = 4180%
Example