Explain which of the following is a fixed cost or a variable cost for Toyota
a. The cost of aluminum used for its automobiles.
b. The property taxes on its Toyota City assembly plant.
c. The cost of labor for its assembly line workers.
d. The yearly payments for the naming rights for the Toyota Sports Center in El Segundo, California, the United States.
e. The salary paid to Akio Toyoda, the Chief Executive Officer of Toyota.
f. The cost of tires it purchases from Pirelli for its vehicles.