Calculate the present value of the following: a-1. Annual payment of $800 for 10 years at 5% interest. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. a-2. Annual payment of $600 for 15 years at 5% interest. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. a-3. Which option would you prefer? b-1. Annual payment of $800 for 10 years at 20% interest. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. b-2. Annual payment of $600 for 15 years at 20% interest. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. b-3. Which option would you prefer