On November 14, 2011, Noel sells 2,000 shares of Marker, Inc., stock for $6,000. He had purchased the stock two years earlier for $10,000. Because the price of the stock continued to drop, Noel purchases additional shares of Marker stock on December 10, 2011. What are the tax effects of the sale of the stock and the basis in the new shares if Noel

a. Repurchases 2,000 shares for $5,000?

b. Repurchases 800 shares for $2,000?

c. Repurchases 4,000 shares for $9,000?