A doctor prescribed 18 cubic centimeters of a certain drug to a patient whose body weight...

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Last Updated on May 10, 2023

GMAT OFFICIAL GUIDE PS

Solution:

Since the typical dosage is 2 cubic centimeters per 15 pounds of body weight, a person who is 120 pounds (8 times as much as 15 pounds) should be given 8 times the typical dosage. That is, the patient should be given 2 x 8 = 16 cubic centimeters of the drug. Since the patient is actually given 18 cubic centimeters of the drug, we need to determine by what percentage greater 18 is than 16. Recall that if A > B, the percentage that A is greater than B can be calculated by the formula:

[(A – B)/B] x 100

So here we have:

[(18 – 16)/16] x 100

2/16 x 100 = 1/8 x 100 = 12.5 percent

Answer: D

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