4. Narat, the manager of a local computer store, estimates the demand for Apple Air Pod for the next five months, as shown in the table below. Because the demand is lumpy, Narat applies the "Dynamic Lot Sizing" method to order the correct quantity. To place an order for the Air Pod costs Narat $70 regardless of the order size, and he estimates that holding a box for over a month will cost him $2. Please answer the following questions (8 Points) Month 1. 2 3 4 5 Demand 20 20 10 40 10 Please find the optimal order quantity and optimal order period using three heuristics. "Silver Meal," "Least Unit Cost," and "Part Period Balancing," and answer these questions: (6 Points) 4.1 Please find the total cost by solving the above three heuristics (3 Points) 4.2 Please fill the optimal order quantity in each month obtained from solving three heuristics in the below table and upload your answer (3 Points) Month 1 3 5 Silver-Meal 2 LUC Part Period Good Luck! 4.1.1 What is the total cost obtained from "Silver Meal Heuristic"? (1Pts) 4.1.2 What is the total cost obtained from "LUC Heuristic"? (1Pts) 4.1.3 What is the total cost obtained from "Part Period Balancing Heuristic"? (1Pts) 4.2 Please "Tick" on a month that "order should be placed" obtained from solving the above 3 heuristics. (5Pts) Month-1 Month-2 Month-3 Month-4 Month-5 Silver Meal LUC PPB Upload your answer to the final table in question 4.2 (No need to show the full calculation)