About App • Just enter the quantity, press the multiplication process button, enter the cost, and press the multiplication process button. The result and the total will be calculated in instant. • Repeat the process for all costs and quantities on the invoice and the final total will be calculated. • You can then save the invoice with a name and it will be included in a new list with the date and time of saving the invoice. • You can review the invoice at any time for modification or deletion. • You can also add the received amount from the invoice value, and the application will record the received amount and it will be saved in a new list at the time of receiving the amount. It also calculates the remaining amount of the invoice value.