A contract with a coal company establishes that the blend required for the power plant must be 35% of high-quality PRB coal (8900 BTU) in weight. North Pit provides 28% of PRB coal, and 72% of 8600 BTU, sold at $12.55 per ton. East Pit provides 44% of PRB coal, and 56% of 8600 BTU, sold at $14.55 per ton. Calculate the least cost per ton of blended coal.