Create your lists. Select or add new items. In the MY PRICE tab, enter the estimated price of the items on your list. In the PRICE SHOP tab you can enter the prices found on the shelves. This will allow the user to compare the collected values with the values informed by the cashier. There is also the REPORTS tab where you can see the differences between the estimated values and the values found in the store. All tabs have totalizers obtained by the quantities x values.