Explanation would be awesome!

Comprehensive Final Review Use the following information for the next two questions: (Present value tables are needed.) Miami Marine Enterprises is evaluating the purchase of an elaborate hydraulic lift system for all of its locations to use for the boats brought in for repair. The company has narrowed their choices down to two-the B14 Model and the F54 Model. Financial data about the two choices follows. What is the net present value of the B14 Model? $17, 395 positive $21, 930 negative $38, 455 positive $358, 455 positive What is the net present value of the F54 Model? $21, 930 negative $38, 455 positive $178, 070 positive $218, 070 positive