Rengginang Lorjuk is a typical Madura food that is ordered more by SMEs and is found in Sumenep Regency and several other areas in Madura. This product is made for supplies and orders, where demand will surge at certain times. Therefore, SMEs of Rengginang Lorjuk is required to have good planning in determining the selling price in accordance with the revenue target obtained. Considering that the main raw materials used are sticky rice and ensis leei (lorjuk) are raw materials that have fluctuating prices, this studio compares forecasting methods namely Holt Winter (HW) and Moving Average (MA), supported by MSE and MAPE, in order to obtain accurate forecasting results. These forecasting results show that HW has better accuracy than the MA, which is then used to calculate the cost of production with an Activity-Based Costing system, which requires charging costs for all activities carried out in production, namely the cost of raw materials, direct labor costs, and overhead factory fee. Using MAPE values, this study yields 4 estimates of production costs in accordance with changes in raw material costs.

Based on observations by DPL and KKN students of Madura University, Blaban Village is located on a plateau of rocks that make it difficult to grow plants. The soil condition of Blaban village is barren and dry during the dry season, during the rainy season the soil is cracked so that it needs water absorption to collect rainwater in the soil and improve the structure of the dry soil during the dry season. With a combination of science from soil structure (Geophysical Science), water supply in the soil (Geophysical Science), liquid fertilizer (Agricultural Science), product processing (Industrial Engineering), quality and quantity management (Industrial Engineering and Management Science), financial management (Economics), marketing management (Industrial and Economic Engineering) even taking care of business licenses (Legal and Administrative Sciences), and online sales using applications (Informatics Engineering). In order to maximize the processing of purple uwi into purple uwi chips in Blaban Village, the initial planting of purple uwi to processing as well as selling purple uwi chips are done through offline and online methods. The results obtained are optimizing the sale of purple uwi crops into purple uwi chips, which has more demand by all consumers in various regions.