With this app you can add your store products names, purchase prices, sale price and stock quantity. Then if you make a sale, you can track the current stock of your products and see how much profit did you make.
Add a new product, give it more details by adding title, cost per item, price per item and its quantity. Then when you sell it, input how much did you sell. Then you will see your statistics easily.
Get this app now from Google Play by clicking this button: