The following are business rules implemented by Athirah Enterprise, an online book store. Megaprasad, the credit manager of Athirah Enterprise has decided to improve their sales management. The books from kids and education section are piling up. Thus a system to attract order for this two sections will be offered. Discount allowed on customers order are required to comply with the following policy. Any books orders from children section, 20% discount will be offered. Meanwhile, orders of text book will attract 25% discount. No discount is offered for other genres. Sometimes, this company offer huge saving. For example, Athirah Enterprise has a mega sale in December every year. During this month, every purchase will be allowed with 50% discount regardless of genres. Customer who order books during their birthday month also entitled with a 35% discounts. This system also requires new customer to pay in advance, unless they made their orders during mega sale. Others will pay upon delivery.

REQUIRED:

Simplify the decision table. Based on the decision table created earlier, identify different type of customers who have to pay in advance.