4153.33% is the change from 15 to 638
Calculation steps:
[( 638 - 15 ) ÷ 15] x 100 = 4153.33%
Formula
Percentage change = [(638 - 15) / 15] x 100
Subtract the new number by the original number
638 - 15 = 623
623 ÷ 15 = 41.53333333333333
41.53333333333333 x 100 = 4153.33%