Final answer:
Mr. Joy received a total of 8 teaspoons of Robitussin after taking the prescribed dose of 2 teaspoons every 4 hours for a total of 4 times throughout the day.
Step-by-step explanation:
The question pertains to calculating the total amount of Robitussin cough medicine Mr. Joy received based on the prescription written by Dr. C. The prescription specifies 2 teaspoons of Robitussin to be taken orally every 4 hours as needed (PRN). If Mr. Joy took the medication 4 times during the day, we need to calculate the total intake. By multiplying the number of doses (4) by the amount per dose (2 teaspoons), we can determine his total consumption.
4 doses * 2 teaspoons per dose = 8 teaspoons
Therefore, Mr. Joy took a total of 8 teaspoons of Robitussin throughout the day.