Buy a pound get half a pound free. It is known that one type of chicken fork bone is $12 per pound and the other is $15 per pound but buy one pound get half a pound free. Assume that the cost of chicken fork bone is c yuan per pound. For the first strategy, the profit is $12 - c per pound of fork bones sold. For the second strategy, each pound of chicken fork bones sold actually provides 1.5 pounds of chicken fork bones, so the profit is $15 - c$/2 (since 1.5 pounds of chicken fork bones are actually sold). Using mathematical expressions, we can express this as: profit 1 = 12 - c, profit 2 = 15 - 0.5c When the cost of the chicken fork bone is 10 yuan / kg: the profit of the first strategy: 2 yuan / kg, the profit of the second strategy: 10 yuan / kg So, of these two strategies, the more profitable sales strategy is: buy a pound and get half a pound.