Mom &Pop Inc

Short Answer

Mom &Pop Inc.has a demand forecast for the next 6 month.It can currently produce 2000 units per month and each worker can produce 250 units per month each.If company is using a pure level strategy, how many units in total needs to be back ordered for a period?
$$\begin{array} { l | l l l l l l } \text { Month } & 1 & 2 & 3 & 4 & 5 & 6 \\\hline \text { Demand } & 1,000 & 500 & 3,000 & 4,000 & 3,000 & 500\end{array}$$