Final answer:
Amy's tax basis in the stock received in the exchange would be $300.
Step-by-step explanation:
Amy's tax basis in the stock received in the exchange would be determined by subtracting the assumed liability from the fair market value of the stock received.
In this case, Amy received stock with a fair market value of $450 and the corporation assumed a liability of $150. Therefore, Amy's tax basis in the stock would be $450 - $150 = $300.