Please explain how you got each answer for thumbs up.

EXAMPLE:

Develop another plan for the Mexican roofing manufacturer described in Examples 10 to 40 and Solved Problem 13.10. a. For this plan, plan 5, the firm wants to maintain a constant workforce of six, using subcontracting to meet remaining demand. Is this plan preferable? b. The same roofing manufacturer in Examples 10 to 40 and Solved Problem 13.10 has yet a sixth plan. A constant workforce of seven is selected, with the remainder of demand filled by subcontracting. c. Is this better than plans 1-5? PX Graphical Approach to Aggregate Planning for a Roofing Supplier A Juarez, Mexico, manufacturer of roofing supplies has developed monthly forecasts for a family of products. Data for the 6-month period January to June are presented in Table 13.20. The firm would like to begin development of an aggregate plan. Table 13.2 Monthly Forecasts MONTH EXPECTED PRODUCTION DEMAND PER DAY (COMPUTED) DEMAND DAYS Jan. 900 41 Feb. 700 18 39 Mar. 800 21 38 Apr. 1,200 21 57 May 1,500 68 June 1,100 20 55 | 6,200 124 APPROACH Plot daily and average demand to illustrate the nature of the aggregate planning problem. SOLUTION First, compute demand per day by dividing the expected monthly demand by the number of production days (working days) each month and drawing a graph of those forecast demands (Figure 13.3). Second, draw a dotted line across the chart that represents the production rate required to meet average demand over the 6-month period. The chart is computed as follows: Average requirement = Total expected demand Number of production days = 6.200 124 = 50 units per day Figure 13.3 Graph of Forecast and Average Forecast Demand Forecast demand 70 60 Level production, using average monthly forecast demand Production rate per working day 50 40 30 0 Jan Feb. Mar June Apr. 21 May T 22 22 18 21 20 Month Number of working days