Draw a context diagram that represents a Supply Ordering System (SOS). This system is to be used by EraTech company to supply computers to their clients whenever order has been finalised. Decompose this to a level-0 diagram. Document the process description into Structured English and Decision Tree based on the discount policy given below.
Discount policy:
Using the SOS, EraTech sends out invoices monthly and will give discounts if payments are made within 10 days. The discount policy is as follows: If the amount of the order for computer supplies is greater than $1,000, subtract 4 percent for the order; if the amount is between $500 and $1,000, subtract a 2 percent discount; if the amount is less than $500, a discount is not applicable. All orders made via the Web will automatically receive an extra 5 percent discount.