Sales to customers located in the same State as the establishment are sales made ``within the State'' even though such sales may constitute engagement in interstate commerce as where the sale: (a) Is made pursuant to prior orders from customers for goods to be obtained from outside the State; (b) contemplates the purchase of goods from outside the State to fill a customer's order; or (c) is made to a customer for use in interstate commerce or in production of goods for such commerce.
Computing Annual Dollar Volume and Combination of Exemptions