Owen settled on a price of $7,870 for a new car. the dealer had to add 4.5% sales tax to this price, but allowed a $1,200 trade-in for owen's old car. although not a universal practice, add the sales tax to the price of the new car first and then deduct the trade- in value. if the dealer required a 15% down payment, calculate the amount of the purchase price that owen financed.