642.42% is the change from 66 to 490
Calculation steps:
[( 490 - 66 ) ÷ 66] x 100 = 642.42%
Formula
Percentage change = [(490 - 66) / 66] x 100
Subtract the new number by the original number
490 - 66 = 424
424 ÷ 66 = 6.424242424242424
6.424242424242424 x 100 = 642.42%