Professor's Annuity Corp. offers a lifetime annuity to retiring professors. For a payment of $84,000 at age 80, the firm will pay the retiring professor $9,000 a semi-annual until death. If the professor's remaining life expectancy is 10 years, what is effective annual interest rate on this annuity? Multiple Choice 11.32% 17.38% 18.14% 8.69% What is the present value of the following cash-flow stream if the interest rate is 14%? You receive 250 at the end of first year, 1000 at the end of second year, and 560 at the end of third year. (14% is annual interest rate and given annual compounding) (Please round your answer to the nearest whole number] Multiple Choice $1199 $1367 $1588 $1340 How much more is a perpetuity of $1800 worth than an annuity of the same amount for 15 years? Assume an annual interest rate of 7% and cash flows at the end of each period. Given annual compounding. Multiple Choice O $9,320.04 $10,252.04 $9,599.64 $8,854.04