7. Motorola Motor firm has notes payable of $1,800,000, long-term debt of $13,000,000, and total interest expense of $1,300,000. If the firm pays 8 percent interest on its long-term debt, what rate of interest does it pay on its notes payable? a. 11.2% b.14.4% c. 16.8% d. 12.0% e. 15.3%