Three years ago, Adrian purchased 100 shares of stock in X Corp. for $10,000. On December 30 of year 4, Adrian sells the 100 shares for $6,000.

a. Assuming Adrian has no other capital gains or losses, how much of the loss is Adrian able to deduct on her year 4 tax return?

b. Assuming Adrian has no other capital gains or losses, except that on January 20 of year 5, Adrian purchases 100 shares of X Corp. stock for $6,000. How much loss from the sale on December 30 of year 4 is deductible on Adrians year 4 tax return? What basis does Adrian take in the stock purchased on January 20 of year 5?