Answer:
700 units per month
Step-by-step explanation:
Considering the demand for the next for months and the ending inventory required for the last month, the total number of units needed is:
![U_n=500+800+900+300+400\\U_n=2900\ units](https://img.qammunity.org/2020/formulas/business/college/5zpy4x0m3l3lgwpotqnhkl0mqfx03q7rzv.png)
Since the company already has 100 items in inventory, the number of total units the company should produce is:
![U_p=2900-100\\U_n=2800\ units](https://img.qammunity.org/2020/formulas/business/college/5li67r5mixic2gx4a7imcs6k53z850ad7e.png)
The production rate for the next four months is given by:
![r=(2800)/(4)\\r= 700\ units/month](https://img.qammunity.org/2020/formulas/business/college/i1xdler3zhcswwfxsybduoqe0zxxqkk3wf.png)
Check if that level of production satisfies each month's demand:
![\begin{array}{cccc}\ &Required&Inventory\\month\ 1&500&800\\month\ 2&800&1000\\month\ 3&900&900\\month\ 4&300&700\end{array}](https://img.qammunity.org/2020/formulas/business/college/lxy4zrwj4vwrjxlgxoi8ga4zcjh31prqy1.png)