A landscaping supply company produces decorative stones. A ton of coarse stones requires 2 hours of crushing, 5 hours of sifting, and 6 hours of drying. A ton of fine stones requires 6 hours of crushing, 2 hours of sifting, and 2 hours of drying. The coarse stones sell for $500 per ton. The fine stones sell for $800 per ton. In a work week, the plant is capable of 40 hours of crushing, 24 hours of sifting, and 32 hours of drying. First, 1. Formulate an optimization model to decide how much of each kind of stones to produce to maximize total revenue. [, pg1] 2. Solve your model using the Excel solver. [**, pg1] 3. Using a two-dimensional plot, solve your model graphically. 1 Then, by modifying your two-dimensional plot, answer the following questions: 4. How much would it be worth to get another hour of crushing time? 5. How much would it be worth to get another hour of sifting time? 6. How much would it be worth to get another hour of drying time