Christina, who is single, purchased 600 shares of Apple Inc. stock several years ago for $22,200. During her year-end tax planning, she decided to sell 300 shares of Apple for $9,600 on December 30. However, two weeks later, Apple introduced its latest iPhone, and she decided that she should buy the 300 shares (cost of $10,200) of Apple back before prices skyrocket. This is using the 2018 tax code.

a. What is Christina's deductible loss on the sale of 300 shares? What is her basis in the 300 new shares?

b. Assume the same facts, except that Christina repurchased only 150 shares for $5,100. What is Christinas deductible loss on the sale of 300 shares? What is her basis in the 150 new shares?