_____ milliliters of an injection containing 250 mg of aminophylline in each 10 mL should be used in filling a medication order calling for 20 mg of aminophylline. Round answer to the nearest tenth. Do not include units.

Step 1 is to identify the ordered dose and available concentration Ordered Dose: 20 mg Available: 250 mg in 10 mL Step 2 is to calculate the volume to administer Volume = (Ordered Dose ÷ Available Dose) × Available Volume (20 ÷ 250) × 10 20 ÷ 250 = 0.08 0.08 × 10 = 0.8 Result at this step = 0.8 Step 3 is to round to the nearest tenth 0.8 = 0.8 Answer: 0.8