Bird's Eye Treehouses, Inc., a Kentucky company, has determined that a majority of its customers are located in the Pennsylvania area. Therefore, it is considering using a lockbox system offered by a bank located in Pittsburgh. The bank has estimated that use of the system will reduce collection time by 2 days. Average number of payments per day Average value of payment Variable lockbox fee (per transaction) Annual interest rate on money market securities 720 $670 $ 15 4.3% a. What is the NPV of the new lockbox system? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. Suppose in addition to the variable charge that there is an annual fixed charge of $5,000 to be paid at the end of each year. What is the NPV now? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) a. NPV b. NPV