643.94% is the change from 66 to 491
Calculation steps:
[( 491 - 66 ) ÷ 66] x 100 = 643.94%
Formula
Percentage change = [(491 - 66) / 66] x 100
Subtract the new number by the original number
491 - 66 = 425
425 ÷ 66 = 6.4393939393939394
6.4393939393939394 x 100 = 643.94%