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5 12. Present value of an annuity Consider the following cases. Cas Amount of Interest Period e annuity rate (years) A $ 12,000 7% 3 B 55,000 12 15 C700 20 9 D 140,000 7 E 22,500 10 5 a. Calculate the present value of the annuity, assuming that it is (1) An ordinary annuity. (2) An annuity due. b. Compare your findings in parts a(1) and a(2). All else being identical, which type of annuity-ordinary or annuity due is preferable? Explain why