Final answer:
The patient will receive 300 milligrams (mg) of digoxin.
Step-by-step explanation:
To calculate the amount of medication that the patient will receive, we need to multiply the dose of digoxin by the weight of the patient. In this case, the dose is 15 mpg/kg and the weight of the patient is 20 kg.
So, the calculation would be: 15 mpg/kg x 20 kg = 300 mg of digoxin.
Therefore, this patient will receive 300 milligrams (mg) of digoxin.