Correct Answer: P should be purchased instead of R
Explanation:
According to the question,
P > Q. S > R
T is least effective Q = R, S > Q
∴ S/P > Q = R > T
Now, it is given that P is less expensive than R and from the order, P is more effective than R. It means that P should be Purchased as it is more effective and less expensive than R
Discussion & Comments