uandrax Computers is a store that buys computer components for low prices, assembles the components into computers, and then sells the computers at high prices. Each computer is assigned a unique identification number, and computers that have common configurations are categorized into types (e.g. Longitude is a laptop that is easily networked and is recommended for businesses, Element is a desktop that is intended for home and small businesses). Categories can be entered into the database before any computers in the categories are actually assembled. The computer components are purchased from wholesalers. One of Quandraxs purchasing agents submits an order to the wholesaler that has listed a given component for sale. If the order is accepted, one of Quandraxs inventory clerks receives the items. Multiple orders accepted by the same supplier may be consolidated into one purchase. Orders are accepted in their entirety or not at all. Nearly all of Quandraxs orders are accepted. Sometimes the incorrect components are delivered to Quandrax and Quandrax has to return them to the appropriate supplier. Sometimes Quandrax returns components to suppliers for other reasons, such as the result of a change in planned production of a certain category of computers. Only about 10 percent of Quandraxs purchased components are returned to suppliers, and any return would result from only one purchase. When payment is due for a purchase, one of Quandraxs cashiers issues one check for payment in full for the items on that purchase. Sometimes if multiple purchases have been made from the same supplier within a short time, Quandrax pays for those purchases with just one check. One of Quandraxs managers is required to not only authorize all purchase orders greater than $5,000 but also to sign all checks (including checks written for expenditures other than purchases of computer components). Quandrax needs to keep track of the managers participation in these events as well as the participation of other employees in these events. In physically implementing the conceptual model into the database tables, Quandrax wants to combine all employee types into just one table. This means Quandrax would keep the separate employee entities on the E-R diagram, but make just one employee table to represent all of the employee entities, then post keys or make relationship tables as necessary to implement all relationships of employees to the relevant events. All sales are handled via mail or e-mail, as Quandrax does not have any showrooms. Quandrax assigns salespeople to its large corporate customers and the salespeople take sample computers to the customer locations to demonstrate features as part of their sales calls. Only a small percentage of Quandraxs sales calls result in orders, and sometimes a salesperson might need to make several sales calls to the same customer to obtain one order from that customer. Orders also result from customers surfing the Internet and seeing descriptions of the computers on Quandraxs website. These customers are not assigned to specific salespeople; Quandrax only tracks the salesperson that actually took the order. Some of Quandraxs salespeople are hired to handle just such orders and as such are not assigned specifically to any customers. If a customer orders multiple computers on one sale order and some of the computers are immediately available whereas the others are not yet assembled, Quandrax ships the available computers right away and then ships the remainder of the order when the rest of the computers are assembled. Sometimes Quandrax combines computers from multiple sale orders into a single shipment. For example, once a customer ordered 10 computers and the next day decided that wouldnt be enough so he ordered 4 more. Quandrax shipped all 14 computers in one shipment. Quandrax only accepts checks for its sales of computers; customers can pay for multiple sales with a single check, but no partial payments are accepted. Each sale transaction is tracked by a shipment ID; an invoice is sent to the customer that is due within 10 days, with no discounts allowed. Quandrax does not allow any sale returns, that is, all sales are final. Cash receipts are never split between two cash accounts; rather each receipt is assigned to one of Quandraxs cash accounts by one of Quandraxs cashiers. Quandrax also receives cash from other activities such as loans, so the database must allow for that. Suppliers, employees, and customers need to be entered into the database before any transactions involving them occur. The following attributes are of interest to Quandrax; some are related to the Acquisition/payment cycle (Do not use these, they will be used for an exercise in another chapter). The attributes that are related to the sales/collection process must be included in your solution. Do not add attributes to the list. Use the boldface attribute abbreviations in parentheses next to the attributes in the list. List any assumptions you make, along with the reasons behind your assumptions (i.e., state what you think is vague in the problem, say what you are going to assume to clear up the ambiguity, and make a case for that assumption). Purchase Order Number (PO#) Sales Call ID (SC-ID) Supplier ID (SuppID) Cash Receipt ID (CR-ID) Employee ID (EmpID) Customer ID (Cust-ID) Purchase Order Date (PODate) Date of cash receipt (CR-Date) Purchase Date (PurchDate) Name of Customer (Cust-Name) Location of cash account (Ca-Loc) Total sale dollar amount (Sale-Amt) Cash Account Number (CashAcct#) Type of employee (EmpType) Name of supplier (SupName) Date of sale order (SO-Date) Receiving Report Number (RR#) Date of purchase return (PR-Date) Computer Category ID code (Cat-ID) Dollar amount of cash receipt (CR-Amt) Component ID code (CompoID) Current balance of cash account (AcctBal) Cash Disbursement Date (CD-Date) Shipping address for a customer (Cust-Ship) Name of employee (EmpName) Date of sale/shipment of computers (Ship-Date) Purchase return ID (PR-ID) Description of a computer category (Cat-Desc) Cash Disbursement Number (CD#) Computer component description (Comp-desc) Sale Order ID (SO-ID) Total dollar amount of a cash disbursement (CD-Amt) Shipment ID (Ship-ID) Standard cost for a computer component (Std-Cost) Date of sales call (SC-Date) Quantity of a computer component returned (Qty-Ret) Customer check number (CR-Chk#) Type of supplier (wholesaler or individual) (SupType) Identification number for a finished computer (CompuID) Quantity of a computer component ordered on purchase order (Qty-Ord) Proposed selling price for a type of computer on a sales call (Prop-SP) Ordered cost for a computer component on a purchase order (PO-Unit-Cost) Suggested selling price for computers [hint: by category] (List-price) Date assembly was completed for a finished computer (Assemb-Date) Quoted selling price for each item on a sale order (Ord-SP) Actual selling price for a particular finished computer (Act-SP) Quantity of a computer component received on a purchase (Qty-Rec) Actual cost of a computer component on a particular purchase (Item-Unit-Cost) Required: Create a business process level REA model (in either grammar or diagram format) for Quandrax Computers sales/collection process. Be sure to include all relevant entities, relationships, attributes, and participation cardinalities. ********** this comes from Chapter 8, Applied Learning exercise A1 in the textbook Enterprise Information Systems by Dunn, Cherrington, & Hollander