Final answer:
To calculate the number of milligrams of a drug to be given to a patient, we can use the formula: Dose in milligrams = Weight of patient in kilograms x Dose in milligrams per kilogram. First, convert the weight of the patient from pounds to kilograms. Then, calculate the dose in milligrams. The correct answer is option 2: 0.2 mg.
Step-by-step explanation:
To calculate the number of milligrams of a drug to be given to a patient, we can use the formula:
Dose in milligrams = Weight of patient in kilograms x Dose in milligrams per kilogram
First, we need to convert the weight of the patient from pounds to kilograms. Since 1 pound is equal to 0.4536 kilograms, the patient's weight in kilograms would be:
22 lb x 0.4536 kg/lb = 9.9792 kg
Next, we can calculate the dose in milligrams:
Dose in milligrams = 9.9792 kg x 0.2 mg/kg = 1.99584 mg
Therefore, the correct answer is option 2: 0.2 mg.