· The consideration for a supply arrived at on the basis of a normal relation between a buyer and a seller, who are not associated with each other;
· if it is not possible to arrive at a fair market price as prescribed in clause (a) above, it would then be the consideration of a similar supply made previously under similar circumstances;
· if it is not possible to arrive at a fair market price by the above means, it may be determined by the Board on the basis of an impersonal average of considerations arrived at in the course of normal business relations among buyers and sellers, who are not associated with one another