Help?

You have your eyes on a new automobile costing $25,000. If you had the $25,000 and wrote a check for that amount, you could drive off the car lot in your new car. But, you don't have it. "Not to worry," says the salesperson. "We can finance it!" You have $5,000 available and wish to finance $20,000. The dealer's rate is 15% per annum compounded monthly or 15%/year/month and the dealer is willing to help you out by financing it over a 5-year period to keep the monthly payments smaller. The dealer proceeds to add on a 1.25% loan initiation fee of $250. Also, there is a prepaid loan closeout fee of another $250. Then there the paperwork filing and storage fee of $100 and a prepaid loan maintenance fee of only $8/month or $480 for the 60-month loan. At this point, the dealer is talking rather quickly and your head is spinning. You are assured that these smaller fees are required and routine. However, you should not be concerned because they can all be rolled into your loan. The dealer adds up the dollars for you: $20,000 + $250 + $250 + $100 + $480 = $21, 080. He then calculates the loan payment using Excel-PMT $21, 080. He then calculates the loan payment using Excel: = PMT (1.25% 60 -21080 = $501.4. a) What is the monthly rate of "interest" you are really paying for the $20,000 loan? b) What is the nominal annual "interest rate you are really paying for the $20,000 loan? c) What is the effective annual "interest rate you are really paying for the $20,000 loan