13A-15. Can someone show me how to do this problem?

Will rate a thumb up for good response thanks so much (PLEASE CIRCLE OR HIGHLIGHT final answer thx)

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 the table below. There are 8 hours of production per day. This exercise only contains part a. a) The firm would like to begin development of an aggregate plan. For this plan, plan 5, the firm wishes to maintain a constant workforce of 6, using subcontracting to meet remaining demand. Evaluate this plan. To determine whether this plan is desirable, first calculate demand per day for each month (enter your responses rounded to the nearest whole number). Table 1 Production Days 22 Demand Forecast 900 18 700 Month 1 January 2 February 3 March 4 April 5 May 6 June 21 800 Avg Dem Per Other data Prod. Day Inventory carrying cost $8 per unit per month Subcontracting cost per unit $12 per unit Average pay rate $5 per hour ($40 per day) Overtime pay Rate $7 per hour (above 8 hrs per day) Labor-hours per unit 1.6 hrs per unit Cost of increasing daily $300 per unit production rate (hiring & training) Cost of decreasing daily $600 per unit production rate (layoffs) 21 22 1,200 1,500 1,100 20 The production rate per day units. (Enter your response as a whole number.) Fill in the table below. (Enter your responses as whole numbers.) Regular Production Subcontract (Units) Demand 900 Month 1 January 2 February 3 March 700 800 4 April 5 May 6 June 1,200 1,500 1,100 The total regular production cost = $ (Enter your response as a whole number.) The total subcontracting cost = $ (Enter your response as a whole number.) Total cost with plan 5 = $ (Enter your response as a whole number.)