Directions:
A health-drink company's in R & D department is trying to make various diet formulation, which can be used for certain specific purpose. It is considering a choice of 5 alternative ingredients (O, P, Q, R and S), which can be used in different proportions in the formulations. The table below gives the composition of these ingredients. the cost per unit of each of these ingredients is as O: 150, P: 50, Q: 200, R: 500, S: 100.

Question:
Which among the following is the formulation having the lower cost per unit for a diet having 10% fat and at least 30% protein? The diet has to be formed by mixing two ingredients:

Option A):
R and S
Option B):
P and S
Option C):
Q and S
Option D):
P and Q
Option E):
P and R

Correct Answer is Option C):
Q and S

Explanation:
The required diet can be formed by mixing P and S or Q and S but the lowest cost per unit can be obtained by Q and S only.