660.61% is the change from 66 to 502
Calculation steps:
[( 502 - 66 ) ÷ 66] x 100 = 660.61%
Formula
Percentage change = [(502 - 66) / 66] x 100
Subtract the new number by the original number
502 - 66 = 436
436 ÷ 66 = 6.606060606060606
6.606060606060606 x 100 = 660.61%