Q 2257134084.     Directions: Answer the following questions based on the information given below:
A health-drink company's R & D department is trying to make various diet formulations, which can be used for certain specific purposes. 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

O: 150
P: 50
Q: 200
R: 500
S: 100
Which among the following is the formulation having the lowest cost per unit for a diet having 10% fat and at least 30% protein? The diet has to be formedby mixing two ingredients.