8. (14 pts) Hаnk Pym pаys $230 per mоnth оn а 48 mоnth add on loan with a 7.5% APR. After this month's payment, he still has 12 payments before he has repaid the loan. Assume the loan is $15,000. a. Under the actuarial model, what is the unearned interest? b. How much would he have to pay if he decided to pay the loan off now? c. If the Rule of 78 was used, how would the answer in part b change?