During the first quarter of the year, three products were ordered on separate orders at a price of $100 each. Payment terms with the supplier are 3/10, net, 30 and 5% contractual rebate on all purchases paid in full quarterly. Two of the three invoices were paid in five days and the third was paid in 25 days. No other products were purchased from the supplier in the first quarter of the year. The rebate check from the vendor for the first quarter is which of the following: $24, $15, $5, or $14