Problem 5-12 Present Values (LO2) Compute the present value of a $190 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=8%; t= 10 years Present value b.r=8%; t-20 years Present value c.r4%; 10 years Present value d. r = 4%; t = 20 years Present value