Calculate the following:

a. Present value of $200,000 to be received in ten years at a discount rate of 14 percent.

b. Present value of the following series of cash payments: $50,000 to be received in one year, $25,000 in three years, and $10,000 in five years, at a discount rate  of 6 percent.

c. Present value of the following series of cash payments: $10,000 to be received in one year, $25,000 in three years, and $50,000 in five years, at a discount rate  of 6 percent.