A nurse is preparing to administer magnesium sulfate 4 g to a client by intermittent IV bolus over 20 min. Available is magnesium sulfate 4 g in 0.9% sodium chloride 50 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)