(b) The product structure for sub-assembly X1 is shown in Figure 3.1. Table 3.2 lists the current on-hand inventory and lead-times for sub-assembly XI. Sub-Assembly x1 B11) B2B) Alay E11 Ceas DE Em Figure 3.1 Product Structure for sub-assembly X1 20 20 Item Inventory On-Hand Leadtime (Weeks) X1 50 1 B1 2 B2 2 A1 5 1 0 1 D 0 1 E 0 3 Table 3.2 Inventory and lead-times for subassembly X1 Using Week 10 as the time when sub-assembly X1 is needed, construct a time-phased bill of material for X1 (3 marks) Given that the gross requirement for Xi's is 100 units in week 12 and 20 units in week 10, fully complete the Master Production Schedule Net Materials Requirements Plan sheet enclosed with this paper (assume lot for lot' procurement applies) deriving the Net Requirements and Planned Order Release weeks for the following components. (a) Components X1, B1 and B2 (4 marks) (b) Components Al and C (4 marks) (c) Components D and E (4 marks) (ii)