Tina's Material Company hauls gravel to the construction site, using the small truck and large truck. Carrying capacity and operating cost per load are provided in accompanying table. Tina should deliver the minimum of 160 cubic yards per day to satisfy contract with builder. Union contract with drivers needs that total number of loads per day is a minimum of 9. How many loads must be made in each truck per day to minimize total cost? Capacity in cubic yards for the small truck are 20 and for the large truck are 80. Cost per load for the small truck are $82 and for the large truck are $47.