Company X produces a pill that is a combination of vitamin A and vitamin B. The unit costs of vitamins A and B are shown in the table below. You are asked to use the graphical method to identify the optimal solutions for the cheapest cost of the pill.

The above graph presents the five constraints. The constraints are inequalities. The arrows show the directions of inequalities and form the feasible area. 

Notes:

• If needed, round your answer to 2 decimal points.
• If the above tables do not provide sufficient information for you to answer a question, put "9999" to be the answer.
• If there is no feasible solution for this linear programming question, put "9999" to be the answer.
• All questions are independent of each other, i.e. any changes are not carried over to the subsequent question(s).
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Vitamin B 10 9 8 7 S 5 3 2 1 0 0 1 2 3 4 5 Vitamin A 6 7 8 9 10