; (3) the benchmark unit-weighted average price determined under this paragraph for a rebate period, with respect to each dosage form and strength of a rebatable covered part D drug, is the sum of the products of— (A) the new drug weighted average price determined under paragraph (4) with respect to each package size of such dosage form and strength of such drug dispensed during the six month period that begins on the day on which the drug was first marketed; and (B) the ratio of— (i) the total number of units of such package size dispensed during the six month period that begins on the day on which the drug was first marketed; to (ii) the total number of units of such dosage form and strength of such drug dispensed during such six month period; and (4) the new drug weighted average price, with respect to each package size of such dosage form and strength of such rebatable covered part D drug dispensed during the six month period that begins on the day on which the drug was first marketed, is the sum of the products of— (A) each price, as calculated for a unit of such drug, applicable to each package size of such dosage form and strength of such drug during the six month period that begins on the day on which the drug was first marketed; and (B) the ratio of— (i) the number of days for which each such price is applicable during such six month period