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A patient suffering from a duodenal ulcer was prescribed cimetidine for short$-$term relief. On checking into the clinic, the patient shows you his medication: a bottle of clear yellow liquid labeled "cimetidine oral solution $300.m\frac{g}{5}mL."$ The patient states he has taken four $2\mathrm{.}00mL$ doses in the past $24$ hours. What is the total amount of cimetidine he has received in the past $24$ hours? Round your answer to the nearest $mg.$