545.45% is the change from 99 to 639
Calculation steps:
[( 639 - 99 ) ÷ 99] x 100 = 545.45%
Formula
Percentage change = [(639 - 99) / 99] x 100
Subtract the new number by the original number
639 - 99 = 540
540 ÷ 99 = 5.454545454545454
5.454545454545454 x 100 = 545.45%