The following are five proposed projects being considered by an engineer in an integrated transportation company for upgrading an intermodal shipment transfer facility for less than truckload lots of consumer goods. The interrelationships among the projects, and their respective cash flows for the coming budgeting period are shown. Some of the projects are mutually exclusive. Also, certain projects are dependent of others that may be included in the final portfolio. Using the PW method and MARR=10%, determine what combination of projects is best if the capital to be invested is limited to $48,000. Projects B1 and B2- mutually exclusive Projects C1 and C2 - mutually exclusive and contingent on the acceptance of B1 Project D-contingent on the acceptance of C2 Cash Flows at End of Year Project 0 1 2 3 4 B1 -50,000 20,000 20,000 20,000 20,000 B2 -30,000 12,000 12,000 12,000 12,000 4,000 C1 -14,000 4,000 4,000 4,000 C2 5,000 4,000 3,000 2,000 -15,000 -10,000 D 6,000 6,000 6,000 6,000