In this project, we work with time-series data set consisting of daily sales data to predict total sales for every product and store in the next month. This project is a final project for "How to win a data science competition" course on Coursera. The data used in this project are taken from Kaggle.com. The links to the data is https://www.kaggle.com/c/competitive-data-science-predict-future-sales/data.