A reasonable amount for meals shall be calculated according to either of the following meal plans:

(i) boarders whose board arrangement is for three meals or more per day shall pay an amount which equals or exceeds the thrifty food plan for the appropriate size of the boarder household; or

(ii) boarders whose board arrangement is for two meals or less per day shall pay an amount which equals or exceeds two thirds of the thrifty food plan for the appropriate size of the boarder household. When the boarder's payments for room are distinguishable from the payments for meals, only the amount paid for meals will be evaluated in determining if reasonable compensation is being paid for meals. The reasonable monthly amount for meals shall be paid in cash. In no event shall food stamps be paid for meals and be credited toward the monthly payment.