The annually compounded discount rate is 9.0%. You are asked to calculate the present value of a 18-year annuity with payments of $50,900 per year. a. Calculate the PV if the annuity payments arrive at one-year intervals. The first payment arrives one year from now. (Do not round intermediate calculations. Round your answer to 2 decimal places.) Present value b. Calculate the PV if the first payment arrives in six months. Following payments arrive at one-year intervals (i.e., at 18 months, 30 months, etc.). (Do not round intermediate calculations. Round your answer to 2 decimal places.) Present value