An airline company operates 120 airports around the world. The following table summarizes the annual profit from each airport based on the passenger numbers. Airport Annual profit ($ million) Passenger # (million) LAX JFK PEK 30 40 20 5 7 4 The airline company is considering to operate in a new airport in Poland. It is known that the passenger number in the new airport is about 2.4 millions. Please use the linear regression method to forecast the airline's annual profit ($ million) from this new airport in Poland. Assume the parameter values are a 12, and b = -2.4. Input should be an exact number