Cost Information: Subcontracting cost = SR 38 per unit per month Average pay rate = SR 28 per hour Labor-hours to produce a unit = 4 hours per unit Daily working hours = 8 hours a) Using excel, calculate the total cost of the following.plan : - Plan is to maintain a constant workforce at a level necessary to meet the lowest demand month and to meet all demand above this level by subcontracting. (Answer in Field ) b) if it is given to you that the cost of increasing daily production rate (hiring and training) is $600 per unit and the cost of decreasing the daily production rate (layoffs) is $700 per unit. what would be the total cost if we used varying the workforce size by hiring and layoffs c) which plan should the company follow?