Community-acquired pneumonia

A 71 old female with community-acquired pneumonia caused by certain bacteria. Her height is 5’1” and her weight is 100 lbs. Rx: Administer 500mg of azithromycin as an infusion diluted in 250mL of 0.9% NaCl over a period of 60 minutes.

Based on the prescribed dose and the information below, how many mL of the reconstituted azithromycin will need to be added to 250mL of 0.9% NaCl?