680.3% is the change from 66 to 515
Calculation steps:
[( 515 - 66 ) ÷ 66] x 100 = 680.3%
Formula
Percentage change = [(515 - 66) / 66] x 100
Subtract the new number by the original number
515 - 66 = 449
449 ÷ 66 = 6.803030303030303
6.803030303030303 x 100 = 680.3%