Total price = $266.63 + $317.29+62.78=646.7Â
Discount = 15%Â
Discount amount = (15/100) x 646.7Â
 =$97.005Â
Price after discount = $646.7 - $97.005Â
 =$549.695Â
Sales tax = 6%Â
Sales tax amount =(6/100) x $549.695Â
 =$32.9817
 Total cost = Price after discount + sales tax amount
 =$549.695 + $32.9817
 =$582.6767Â
=$582.68