An intravenous dose of azithromycin is usually prepared by injecting a measured small amount of sterile water into a sealed vial containing a specifc known amount of solid formulation containing the medication and shaking the vial until all of it is dissolved. Te dosage to be administered to a patient is then removed (with a syringe) and added to a specifc volume of diluent solution, which is then administered as an IV drip. A diluent solution that is commonly used is 1/2 normal saline (0.45% sodium chloride solution). If an azithromycin formulation contains 500 mg of azithromycin and sterile water is added to make 5 mL of the formulation, how much must be removed with the syringe to add to the diluent solution for a dosage of 80 mg? (3points)