540.91% is the change from 66 to 423
Calculation steps:
[( 423 - 66 ) ÷ 66] x 100 = 540.91%
Formula
Percentage change = [(423 - 66) / 66] x 100
Subtract the new number by the original number
423 - 66 = 357
357 ÷ 66 = 5.409090909090909
5.409090909090909 x 100 = 540.91%