<![CDATA[Inventory is one of the factors that can determine the size of the company's profits. The inventory in question is raw material inventory. In determining the size and optimal amount of raw material inventory, calculation steps are needed that the company must know. So that inventory does not pile up, the company must know the optimal amount of inventory the company must have, of course it is closely related to the amount of raw material purchases needed. PT. Duta Beton Mandiri is a part of the Duta Group which focuses on the field of ready-mix concrete production. The products produced by PT. These Mandiri Concrete Ambassadors include paving, castine, stone milling uditch, precast, bishop's hat, brick, and ready mix. The main raw materials are sand, cement, gravel and paint. To determine the optimal amount of raw material inventory, the research method used is a descriptive method, with data collection techniques, interviews, literature studies, simple observation and observation. Then, calculations are carried out using the lot sizing method to determine the order quantity, order frequency and total inventory costs. It is known that the inventory needed each period is in optimal quantity. From the results of the calculation analysis using the EOQ Lot Sizing Technique, the resulting total cost is 46.91% smaller than the previous total cost, namely Rp. 113,400,000. With these results, the company has found a more optimal amount of inventory with minimal total costs.]]>
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