8.2 (10 pts) Based on the scraper specifications in Table 8.1 and the "performance charts" in Figs. 8.8 and 8.9, and for haul conditions as stated here, analyze the probable scraper production. The material to be hauled is cohesionless. It has a swell factor of 0.87 and a unit weight of 2,700 lb/bcy. The expected rolling resistance for the well-maintained haul road is +4%. Assume a 0.85-min load time and that the scraper can carry a load of 88% of heaped capacity. To account for both acceleration and deceleration use an average speed of 5 mph over a distance of 200 ft. Use a 55-min hour efficiency factor. The length of haul is 4,000 ft one way with a +6% grade when moving from cut to fill. The total cost to operate one scraper is $350 per hour and to operate the push tractor is $200 per hour Assuming that there is only one pusher available, how many scrapers should be used based on best production cost and what will be the production cost in $/bcy? not noted