You receive an order for 250 mg of Aminophylline in normal saline (total volume 500 ml). The patient weighs 110 lb. The Aminophylline is to be administered at a dose of 0.4 mg/per/kg per hour. Aminophylline Injection is supplied in 10 mL vials with 25 mg/mL. The IV set to be used delivers 60gtts/ml. What will be the flow rate, in drops per minute, to administer the dose ordered?