Enter the total price (1) and number (2). Then the unit price is automatically shown.(3) If you want to delete the result, tap "clear" button. (4)

Enter the total price (1) and number (2). Then the unit price is automatically shown.(3) Tap "save" button (4), then the data is saved to the list. Then tap the list tab. (5)

You can see the saving data on the list. If you want to delete an item, tap "edit" button. (6), then delete it. If you want to delete all items, tap "clear" button. (7)

You can remove ad with purchasing In-App Purchase. To do this, tap "cart" button. (1) If you are the first time to buy, tap "Buy Remove Ad". If you have already purchased and want to restore this functionality, tap "Restore Remove Ad".