(b) For the master production schedule shown below, determine the planned order release schedule using the economic time cycle (ETC) batch sizing rule. Calculate the total variable costs for the 10-week planning period Week 1 2 3 4. 5 6 7 8 9 10 Demand 52 34 50 100 75 36 68 0 85 There are currently 100 parts on hand. The cost per setup is estimated to be 200 and the holding cost is 2 per unit per week. The lead time is two weeks. You may use Fig Q.B6 in your answer. (Make sure you write your registration number and seat number on it and include it with your answer book.) (6 marks) c) Discuss any reservations you may have about the ETC method and comment on its relative performance. (4 marks)