Seventy cents. According to the market survey, a kilo of flour is needed to burn one yuan of old Beijing, which is 1.5 yuan, and one kilo of flour can burn about1.Based on this calculation, the cost of a fire is 0. 12 yuan. The market price of donkey meat is one catty in 20 yuan and one catty in 25 yuan. A kilo of raw meat can produce eight taels of cooked meat, while a kilo of cooked meat can make 28 donkey fires, which is equivalent to a profit of 7 cents each. Profit is the business achievement of entrepreneurs, a comprehensive reflection of the business effect of enterprises, and a concrete embodiment of their final results.