calculate the present value of the following: a-1. annual payment of $1,000 for 10 years at 5% interest. note: do not round intermediate calculations. round your answer to 2 decimal places.) a-2. annual payment of $800 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 $1,000 for 10 years at 20% interest. note: do not round intermediate calculations. round your answer to 2 decimal places.) b-2. annual payment of $800 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?