810.61% is the change from 66 to 601
Calculation steps:
[( 601 - 66 ) ÷ 66] x 100 = 810.61%
Formula
Percentage change = [(601 - 66) / 66] x 100
Subtract the new number by the original number
601 - 66 = 535
535 ÷ 66 = 8.106060606060606
8.106060606060606 x 100 = 810.61%