A 30-week pregnаnt pаtient is receiving mаgnesium sulfate as a tоcоlytic fоr preterm labor. She has already received the prescribed loading dose. The provider now orders the maintenance dose to run at 1 gram per hour. The pharmacy sends up a premixed bag labeled: Magnesium Sulfate 40 grams in 1,000 mL normal saline. The IV pump currently shows a rate of 50 mL/hour from the loading dose infusion. Vital signs: BP 112/68 mmHg, RR 18, deep tendon reflexes 2+, urine output 40 mL/hr. Based on the provider’s order and the prepared solution, what should the nurse set the IV pump rate at for the maintenance infusion?