Let's suppose that for the month of December, company A's stock decreased from $40 to $36 per share and company B's stock decreased from $48 to $45 per share. If you invested a total of $20,400 in the stock of these two companies at the beginning of December and then sold their stocks at the end of December for $18,585, then how many shares of each stock did you buy? Show all the necessary work that you need perform to arrive at the answer. The answer should be in the form of a sentence. (10 points)