How can i solve optimalsolution??

Q. Find optimal solution Demand & # of working days Jan Feb Mar Ap May Jun Total Forecast 2.760 3.320 3,970 3,540 3,180 2,900 19,670 # of working days: 21 20 23 21 4 units/worker/day inventory holding cost is $2 per gear per month. oHiring cost: $200 per worker Layoff cost: $500 per worker Wages and benefits: $15/worker/hour 8 hours/ day, 35 workers Beginning workforce level1437 Beginning inventory level -215000 Ending inventory level 5 days of supply (67000 units) allow backorder