Could you explain this questions with equation?

I mean how to solve this question.

Please answer this question.

The Crossroad, Inc. has the following 4 monthly shipments: From To St. Louis, MO Nashville, TN Chicago, IL 25,000 lb. 30,000 Columbus, OH 20,000 22,000 Shipments smaller than 40,000 lb are served by LTL, with unit shipping rates: From To St. Louis, MO Nashville, TN Chicago, IL $4 per lb. Columbus, OH 12 The Director of Logistics Operations has received a proposal to build a cross docking center in Indianapolis, IN. If approved, all future shipments will go through the center. The unit LTL rates to or from Indianapolis are: From Chicago, IL From Columbus, OH To St. Louis, MO To Nashville, TN $5 per lb However, shipments bigger than 40,000 are served by FTL, and the unit shipping rates are only 60% of those of LTL. a. How many monthly shipments will Crossroad have after building the cross docking center? List the origin, destination, shipment size, LTL or FTL, and unit shipping rate. (2 points) b. Calculate the transportation cost without the cross docking center. (2 points) C. Calculate the transportation cost with the cross docking center. (2 points) d. If building the cross docking center costs $5 million, and Crossroad is looking for a 3 year break-even. Should the Director support the proposal? (1 point)