The prognosis models are by their same definition tools to quantify phenomena to develop methodologies for the decision making. Taking into account this situation the following problem considered: What is the forecast model and the quantity per package in domestic sales of the company Rubio SAC?_x000D_ By means of the prognosis models we can put financial and commercial phenomena in statistical terms, which allow to see the things us from the suitable perspective and low terms directly applied to the case, finally to make a decision that allows so much the economic efficiency as technical in the companies. Specifically, Models ARIMA will be the objective of this investigation. One says that models ARIMA reflect the behavior of a phenomenon through a certain period._x000D_ Coming to determine the forecasting model estimated for the series of the quantity per package sold by the company Ru...