Problem 5-12 Present Values (LO2) Compute the present value of a $140 cash flow for the following combinations of discount rates and times. (Do not round Intermediate calculations. Round your answers to 2 decimal places.) a. r = 10%; t. 9 years Present value b. r- 10%; t = 18 years Present value c.r5%; t = 9 years Present value b. r= 10%; t= 18 years Present value c. r= 5%; t = 9 years Present value d. r= 5%; t = 18 years Present value