A jewelry store makes necklaces and bracelets from gold and platinum. The store has 18 ounces of gold and 20 ounces of p

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A jewelry store makes necklaces and bracelets from gold and
platinum. The store has 18 ounces of gold and 20 ounces of
platinum. Each necklace requires 3 ounces of gold and 2 ounces of
platinum, whereas each bracelet requires 2 ounces of gold and 4
ounces of platinum. The demand for bracelets is no more than four.
A necklace earns $300 in profit and a bracelet, $400. The store
wants to determine the number of necklaces and bracelets to make in
order to maximize profit.
a. Formulate a linear programming model for this
problem.
b. Solve this model by using graphical
analysis.
c. Find the value of the slack or surplus associated
with each constraint.