The regular price of a computer is x dollars. Let f(x) = x - 400 and g(x) = 0.75x.
a. Describe what the functions f and g model in terms of the price of the computer.
b. Find (f ° g)(x) and describe what this models in terms of the price of the computer.
c. Repeat part (b) for (g  f)(x).
d. Which composite function models the greater discount on the computer, f ° g or g ° f? Explain.