7- The student in Problem 5-6 wanted to buy a car costing $24,000 from a dealer offering 0% down and 10 financing at 6% interest over 60 months. Her disposable income is $500 per month. A (a) What monthly interest rate can she afford? What effective annual rate is this? (b) Insurance on this car will be $50 per month more than she had planned, which will leave her with only $450 per month for her car payment. Now what monthly interest rate can she afford? What effective annual rate is this