please show step by step

detailed calculations

3. Develop a material requirement plan for end item P and its components, given the tree below. Assume that all lead times are one week, and that lot-for-lot ordering is used except for item F, which is ordered in multiples of 400 units. One hundred units of P should be available at the start of week 4 and at the start of week I. 8. Beginning inventories are: 20 P. 100 A, and 200 F. Scheduled receipts are: 800 F at the start of week 1. P B3) A(2) D C(2) D+) F(2) F(2) (70points)