mpicillin sodium 250 mg in 50 mL of 0.9% NaCl is being administered over a period of 30 minutes. The drop (gtt) factor is 10 drops (gtts) per mL. The nurse is asked to check the flow rate of the infusion. The nurse determines that the infusion is running at the prescribed rate if the infusion is delivering how many drops per minute? Fill in the blank. Record your answer to the nearest whole number.