544.44% is the change from 99 to 638
Calculation steps:
[( 638 - 99 ) ÷ 99] x 100 = 544.44%
Formula
Percentage change = [(638 - 99) / 99] x 100
Subtract the new number by the original number
638 - 99 = 539
539 ÷ 99 = 5.444444444444445
5.444444444444445 x 100 = 544.44%