Although the entire question is posted, parts d & e are the ones I require in this post. Please include thoughts, rationale and steps as I am learning.

38. Applied Technology Inc. (ATI) produces bicycle frames using two fiberglass materials that improve the strength to weight ratio of the frames. The cost of the standard-grade material is $7.50 per yard and the cost of the professional-grade material is $9.00 per yard. The standard- and professional-grade materials contain different amounts of fiberglass, carbon fiber, and Kevlar, as shown in the following table:

	Standard Grade	Professional Grade
Fiberglass	84%	58%
Carbon Fibre	10%	30%
Kevlar	6%	12%

ATI signed a contract with a bicycle manufacturer to produce a new frame with a carbon fiber content of at least 20% and a Kevlar content of not greater than 10%. To meet the required weight specification, a total of 30 yards of material must be used for each frame.

1. Formulate a linear program to determine the number of yards of each grade of fiber-glass material that ATI should use in each frame in order to minimize total cost. Define the decision variables and indicate the individual purpose of each constraint.
2. Use the graphical solution procedure to determine the feasible region. What are the coordinates of the extreme points?
3. Compute the total cost at each extreme point. What is the Optimal solution?
4. The distributor of the fiberglass material is currently overstocked with the professional-grade material. To reduce inventory, the distributor offered ATI the opportunity to purchase the professional-grade material for $8 per yard. Will the optimal solution change?
5. Suppose that the distributor further lowers the price of the professional-grade to $7.40 per yard. Will the optimal solution change? What effect would an even lower price for the professional-grade material have on the optimal solution? Explain.