536.36% is the change from 66 to 420
Calculation steps:
[( 420 - 66 ) ÷ 66] x 100 = 536.36%
Formula
Percentage change = [(420 - 66) / 66] x 100
Subtract the new number by the original number
420 - 66 = 354
354 ÷ 66 = 5.363636363636363
5.363636363636363 x 100 = 536.36%