To be included in gross proceeds of sales is the money value of property purchased at wholesale for resale purposes and subsequently withdrawn from stock for use or consumption by the purchaser.
The value to be placed upon such goods is the price at which these goods are offered for sale by the person withdrawing them. All cash or other customary discounts which he would allow to his customers may be deducted; however, in no event can the amount used as gross proceeds of sales be less than the amount paid for the goods by the person making the withdrawal.
S.C. Code Regs. § 117-309.17