Arden purchased 300 shares of AMC common stock (NYSE: AMC) several years ago for $1,500. On April 30, Arden sold the shares of AMC common for $500 and then purchased 250 shares of AMC preferred stock two days later for $700. The AMC preferred stock is not convertible into AMC common stock. What is Ardens deductible loss from the sale of the 300 shares of AMC common stock