on a $10,000 loan which is paid off by 48 installments of $254 with the first payment due 1 month after receipt of the loan, the annualized rate of interest is _____% on an APR basis. Expressed at an effective compound annual rate, it is ___%

a.8.40;8.73

b.9.24;9.64

c.10.08;10.56

d.11.52;12.15

need calculation steps.