Question 1 A. Solve the following system of equations using a matrix method: x1 + 2x2 + 3x3 = 14 2x1 + 5x2 + 2x3 = 18 3x1 + X2 + 5X3 = 20 B. What are the FIVE (5) benefits obtained from proper planning and control of inventory? C. Sparking Inc sells beauty supplies. The annual demand for a skin spackle is 17,000 units. The cost of placing an order is $50, while the holding cost per unit per year is 20 percent of the cost. This item currently costs $12.50 if the order quantity is less than 1500. For orders of 1501 units up to 10,000 units the cost falls to $12.45 and for orders of 10,001 or greater, the cost falls to $12.40. i. To minimize total cost, how many units should Sparking Inc order each time it places an order? ii. What is the minimum total cost