A store offers two payment plans. Under the installment plan, you pay 25% down and 25% of the purchase price in each of the next 3 years. If you pay the entire bill immediately, you can get a discount of 10% on the purchase price. Assume the product sells for $5. a-1. Calculate the present value of the payments if you can borrow or lend funds at an interest rate of 5 percent. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. a-2 Which is a better deal? b-1. Calculate the present value if the payments on the 4-year installment plan do not start for a full year. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. b-2. Which is a better deal