Calculation: A pharmacist needs to prepare 6 suppositories, each containing 300 mg of acetaminophen. They are to be administered for two days to a child. Suppose the pharmacist weighs 6 blank cocoa butter suppositories and the average weight is 2 gram. The average weight of six medicated suppository is 1.8 gram, prepared by the same mold. Calculate the density factor of acetaminophen: ___________.