Quality Building Supply has two kinds of customers: contractors and the general public. Sales to each are slightly different.
When a contractor buys materials, he or she takes them to the contractor checkout desk. The clerk enters the contractor’s name into the system. The system displays the contractor information, including his/her current credit standing.
The clerk then opens up a new ticket (sale) for the contractor. Next, the clerk then scans in each item to be purchased. The system finds the price of the item and adds the item to the ticket. At the end of the purchase, the clerk indicates end of sale. The system compares the total amount against the contractor’s current credit limit, and if it is acceptable, finalizes the sale. The system creates an electronic ticket for the items, and the contractor’s credit limit is reduced by the amount of the sale. Some contractors like to keep a record of their purchases, so they request that the ticket details be printed out. Others aren’t interested in a printout.
A sale to the general public is simply entered into the cash register and a paper ticket is printed as the items are identified. Payment can be by cash, check, or credit card. The clerk must enter the type of payment to ensure that the cash register balances at the end of the shift. For credit card payments, the system prints out a credit card voucher that the customer must sign.
Based on the description, develop the Data Flow Context diagram.
Who can help me to solve this questions .
Thank you
