Suppose mortality follows Demoivre's law with @ = 110 and that the interest rate is 0. A term insurance policy on (60) has a level death benefit of 1000 payable at the moment of death provided this occurs within 40 years. Net level premiums are payable continuously for 20 years at the annual rate of . (a) Find . (b) Find 10V by both the prospective and retrospective methods.