please solve quickly i haven't so many time.

Consider the product structure diagram given in figure below. Product A B (2) 2 weeks C (3) 1 week D (2) 2 weeks E (3) 1 week F (2) 2 weeks Suppose that the master production schedule for product A is; Week Demand 78 100 125 9 10 90 300 11 12 13 46 81 15 The holding cost for each item is $0,8 per part, per week and the fixed order cost is estimated to be $200. There is no scheduled receipts or on hand inventory for product B and F. c) Determine the lot sizes using the part period balancing d) Determine the lot sizes using the Wagner - Whitin Algorithm