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The model of aircraft is designed such that the volume of its interior airspace is #125 cm^3.# The volume of the airspace of the actual aircraft is 3.375 liters.
(a) Given that the wing span of the actual aircraft is 7.44 m, find the wingspan of the model in centimeters.
(b) If the total surface area of the model is #2420 cm^2#, find the total surface area of the actual aircraft in square meters.
(c) Calculate the cost of the materials used to build the actual aircraft if the material costs US$ 2.5 per square centimeter.