A post-operative client has an order for Demerol 35 mg and Phenergan 12.5 mg. The nurse reviews the labels of the medications. Injectable Demerol (meperidine hydrochloride) is prepared as 50 mg / ml and Phenergan (promethazine hydrochloride) is prepared as 25 mg/ml. How many cc total should the nurse administer? Show your work.