4. The president of Hill Enterprises, Teri Hill, projects the firm's aggregate demand requirements over the next 8 months as follows: January 1,500 May February 1,500 June 2,200 2,300 March April 1,700 1,800 July August 1,700 1,700 Her operations manager is considering a new plan, which begins in January with 200 units of inventory on hand. Stockout cost of lost sales is $100 per unit. Inventory holding cost is $25 per unit per month. Ignore any idle-time costs. The plan is called plan A. Plan A: Vary the workforce level to execute a strategy that produces the quantity demanded in the prior month. The December demand and rate of production are both 1,600 units per month. The cost of hiring additional workers is $50 per unit. The cost of laying off workers is $80 per unit. Evaluate this plan. (Enter all responses as whole numbers.) Note: Both hiring and layoff costs are incurred in the month of the change. For example, going from 1,600 in January to 1,500 in February incurs a cost of layoff for 100 units in February Hire Layoff Period Month Demand Production (Units) (Units) 0 December 1,600 1,600 Ending Inventory 200 Stockouts (Units) 1 January 1,500 1,600 2 February 1,500 1,500 3 March 1,700 1,500 4 April 1,800 1,700 b May 2.200 1,800 6 June 2.300 2,200 ' July 1./00 2,300 B August 1.700 1,700 The total cost of hirings $ The total cost of layoffs= The total inventory carrying cost $ The total stockout costs (Enter your response as a whole number.) (Enter your response as a whole number.) (Enter your response as a whole number.) (Enter your response as a whole number) The total cost, excluding normal time labor costs, is s (Enter your response as a whole number.)