a. Use the appropriate formula to find the value of the annuity. b. Find the interest. Periodic Deposit $80 at the end of every six months Rate Time 4.5% compounded semiannually 25 years Click the icon to view some finance formulas. a. The value of the annuity is $ (Do not round until the final answer. Then round to the nearest dollar as needed.) b. The interest is $. (Use the answer from part (a) to find this answer. Round to the nearest dollar as needed.)