You make decorative stones for landscaping. A ton of coarse stones requires 2 hours of crushing, 5 hours of sifting, and 8 hours of drying. A ton of fine stones requires 6 hours of crushing, 3 hours of sifting, and 2 hours of drying. The coarse stones sell for $400 per ton. The fine stones sell for $500 per ton. In a work week your plant is capable of 36 hours of crushing, 30 hours of sifting, and 40 hours of drying. How many tons of each stone should you produce to maximize revenue?