Elixirs are hydroalcoholic solutions (commonly containing ethanol) that pharmacist use in the preparation of particular oral dosage forms of certain drugs. Consider an elixir made with drug A (1600mg), ethanol (15ml) simple syrup (USP, 40 ml) and water (40ml). The pharmacist prepares the formulation by adding the drug to ethanol, followed by the water and finally the simple syrup. The product is then dispensed to the patient. What is the percent W/V for drug A in the prescription?