Solve the model formulated in Problem 13 for Irwin Textile Mills graphically.
a. How much extra cotton and processing time are left over at the optimal solution? Is the demand for corduroy met?
b. What is the effect on the optimal solution if the profit per yard of denim is increased from $2.25 to $3.00? What is the effect if the profit per yard of corduroy is increased from $3.10 to $4.00?
c. What would be the effect on the optimal solution if Irwin Mills could obtain only 6,000 pounds of cotton per month?