This is a book for self-employed people. You know sales well. But do you know what to buy? You need to know your purchases/sales to know your profits and credits. This is something you must know when doing business! The features provided are below! ○ Did you earn this month, did you lose money... How much did you make... ○ How much trauma to be paid ○ You can see at a glance how many attempts to receive. ○ Also, who has how much trauma to be paid ○ We will also inform who has the amount left f