PLEASE EXPLAIN HOW TO DO IT!!!!

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 $70 per unit. Inventory holding cost is $25 per unit per month. Ignore any idle-time costs. Evaluate the following plans D and E. Plan D: Keep the current workforce stable at producing 1,600 units per month. In addition to the regular production, another 20% of the normal production units can be produced in overtime at an additional cost of $55 per unit. A warehouse now constrains the maximum allowable inventory on hand to 600 units or less. Note: Do not produce in overtime if production or inventory are adequate to cover demand. Plan D Production (Units) O.T. Production (Units) Stockouts (Units) Demand 1,600 0 0 1,450 1,600 1,600 Ending Inventory 200 350 350 350 150 0 0 Month 0 December 1 January 2 February 3 March 4 April 5 May 6 June 7 July 8 August 0 0 0 1,600 1,600 1,600 1,600 1,600 1,600 320 0 1,800 2,300 2,100 1,900 1,300 230 320 0 180 0 0 300 0 1,600 300 0 The total overtime production cost = $ 51700. (Enter your response as a whole number.) The total inventory holding cost for January through August = $ 37500. (Enter your response as a whole number.) The total stockout cost = $ 28700. (Enter your response as a whole number.) The total cost, excluding normal time labor costs, for Plan D = $ 117900. (Enter your response as a whole number.) Plan E. Keep the current workforce, which is producing 1,600 units per month, and subcontract to meet the rest of the demand. Subcontract cost is $80 per unit. Subcontracting capacity is limited to 550 units per month. The warehouse and overtime constraints from Plan D do not apply to this plan. Plan E Production (Units) Subcontract (Units) Ending Inventory Demand 200 1,450 Month 0 December 1 January 2 February 3 March 4 April 5 May 6 June 7 July 8 August 1,600 1,600 1,800 1,600 1,600 1,600 1,600 2.300 2,100 1,900 1,300 1,600 1,600 1,600 1,600