9- The premiums on an insurance policy are $80 every six months, payable at the beginning of each six-month period. If the policy holder wishes to pay 1 year's premiums in advance, how much should be paid provided that the interest rate is 4.3% compounded semiannually? a) $168.32 b) $155.32 c) $158.32 d) $ 178.32 e) $163.32