For the purposes of this article, a transfer price from a related entity to a person is reasonable (1) if it is the same or greater than the price that such related entity contemporaneously charges unrelated persons at the same level of distribution and in the same geographic area as the person for a similar volume of product of like grade and quality or (2) if it is arrived at by including all uniform costs imposed upon purchasers in the operation of the retail business as determined pursuant to generally accepted accounting principles.