You have the following order: Order: ampicillin 400 mg IM q….

You have the following order: Order: ampicillin 400 mg IM q.6h for 10-year old child who weighs 72 lbs.  Recommended safe dose range is: 25-50 mg/kg/day in equally divided doses at 6 hour intervals   What is the recommended maximum daily dose for this child?