17. Cortina purchased a motorcycle for $8,487. She made a down payment of $2,225. She applied (1 point) for a four-year installment loan with an interest rate of 11.2% What is the total cost of the motorcycle after four years? O$7,797.60 O $10.022.60 O $10,568.64 O $12,793.64 15. Galvin is graduating from college in eighteen months, but he will need a loan in the amount of (1 point) $9.875 for his last three semesters. He may either receive an unsubsidized Stafford Loan with an interest rate of 6.8%, compounded monthly, or his parents may get a PLUS Loan with an interest rate of 7.8%, compounded monthly. The Stafford Loan has a grace period of six months from the time of graduation. Which loan will have a higher balance at the time of repayment and by how much? The Stafford Loan has a higher balance by $164.22. The Stafford Loan has a higher balance by $212.79 The PLUS Loan has a higher balance by $227.06. The PLUS Loan has a higher balance by $604.07