Customer{customer id, customer fname, customer lname, customer address1, address2, addresscity, adress_postalcode, customer tel no, customer_category} /* invoices and statements are usually posted, plan for it even if the course notes dont require it */
customer_category{cust_type, discount} /* four possible entries
Private =>0
Bus_Silver => .1
Bus_Gold => .25
Bus_Diamond => .4 */
single lookup table from the customer id then can reference pricing and returns policies
Hope this assists your school work