Customer orders are handled by a sales associate who enters the sale order and checks inventory availability. Once the order is filled, it is shipped to the customer by a shipping clerk. If a customer order is for multiple computers and not all computers are available, then they may be shipped at a later date.

Customers submit their payment for orders based on the invoice, which is due 30 days from the date of the invoice. Monthly statements are not used, but customers can make installment payments if approved and in this case 50% of the order amount is due 30 days from the invoice date, and the remaining balance is due 60 days from the invoice date. All customer receipts are processed by a cash receipts clerk and deposited daily into the checking account.

Prepare a conceptual business process level REA model for the Revenue cycle for Tekno, Inc. Prepare the model by creating a UML class diagram including multiplicities.