Suppose the demand curve for a product A is given by
QA= 200 - 5PA - 0.1 PB + 0.5 Pc + I
Where PA is the price of the product A, PB is the price of product B, PC is the price of the product C, I is the level of income.
Which statement about the above goods is NOT true?
a. goods A and B are complement goods.
b. good A is an inferior good
c. good A and C are substitute goods
d. We dont know if good C is a normal good or an inferior good.