Answer only part b!!!!!!

[P1) Assume that two customers receive products from three different production facilities. The cost of production at facility iis ci per unit for i = 1.2 a product going from company i to customer j is wu per unit. Because the first two production facilities are not in US, the cost for customs is ki per unit for i = 1,2. The production amount at company 1,2,3 are 10, 15, 20 units per hour. Demand of the customers are 10, and 35 units, respectively. a) Draw a schematic (i.e. draw, do not formulate an optimization model) for this transportation problem (indicate only the costs on the arcs, make sure that every production facility is connected to every customer). b) Assume that customer 1 cannot receive any products from production facility 1. What can you do with the costs to make sure that facility 1 cannot send anything to customer 1? (indicate only the costs on the arcs, make sure that every production facility is connected to every customer)