Production and Inventory Planning Problem

Under normal working conditions, a factory produces up to $100$ units of high$-$power flashlights in each of four consecutive periods at costs that vary from period to period as shown in the table below.

Additional units can be produced by working overtime. The maximum quantity and costs are shown in the table below, together with the forecast demands for the product in each of the four time periods.Production and Inventory Planning Problem

Under normal working conditions, a factory produces up to $100$ units of high$-$power flashlights in each of four consecutive periods at costs that vary from period to period as shown in the table below.

Additional units can be produced by working overtime. The maximum quantity and costs are shown in the table below, together with the forecast demands for the product in each of the four time periods.