Brandy is trying to decide between two cell phones. one is free with the two-year contract but she will have to pay the sales tax of 8% on the original price of $399 and the monthly charge is $10 more then she currently pays. the other is on sale for $199 plus a percent sales tax. the monthly charge is the same as she currently pays. over the two year contract period which phone will be the lower cost and by how much?