Amazon purchases parts from 3 suppliers. The cost for each part is the following = 500, C2 800, C3 = 1000. The demand for each part is: 12 = 15,000, 12 = 10,000, 12 = 5,000. The fixed transportation cost is S=$700, and the cost to deliver each specific product is $150. The estimated interest to calculate holding cost is estimated to be 20% 1 a) Calculate the total cost considering shipping independently b) Calculate total cost considering shipping all product in the same truck. (second method)