421.95% is the change from 123 to 642
Calculation steps:
[( 642 - 123 ) ÷ 123] x 100 = 421.95%
Formula
Percentage change = [(642 - 123) / 123] x 100
Subtract the new number by the original number
642 - 123 = 519
519 ÷ 123 = 4.219512195121951
4.219512195121951 x 100 = 421.95%