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A doctor prescribes an ointment that is 4% hydrocortisone. A pharmacist has 1% and 5% concentrations in stock. How many ounces of each should the pharmacist use to make a 2 ounce tube?
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I found out that 0.5 is to added to 1% to make 4% of 2 oz, but I can not find for 5%.
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