1. Product A is made of Four units of B and two units of C. B is made of three units of D and two E. C is made of three units of F and one unit of E. Lead times for purchase of each unit are: A takes one week, B takes two weeks, C takes one week. D and E take 2 weeks and F takes 3 weeks. Assume that there is a demand for 150 units of A in week 8. There is on-hand inventory of 100 units of B, and 20 units of C. There is a scheduled receipt of E for 500 units in week three. Assume all items are purchased L4L except for item D which is ordered in multiples of 50, F which is ordered in multiples of 100 and E which is 500 a) Show the bill of materials (product structure tree) b) Develop an MRP planning schedule showing gross and net requirements and order release and order receipt dates