A nurse is preparing to administer ampicillin 50 mg/kg/day PO divided in equal doses every 8 hr to a child who weighs 39.6 lb. Available is ampicillin oral suspension 250 mg/5 ml. How many ml should the nurse administer per dose? (Round to the nearest whole number.)
a) 7 ml
b) 8 ml
c) 9 ml
d) 10 ml