Please i need only the equations,

Problem No. 1 A production plan for 12 months and one products needs to be minimized for cost. The product requires 2 hours to assemble. Workers are on salary. Shortages, at a cost of $30 per unit are allowed and need not necessarily be made up. Monthly inventory carrying charge is $1.35 per unit. Hourly wages are $22.75, including benefits. There is hiring or firing ($3000 and $6500 each, respectively) and the initial available labor force is 50 workers. Overtime is limited to 30 hours per month per worker The selling price is $199.99. No initial inventory and there is no limit on inventory at the end of period 12. Write all the necessary equations