15. Christina, who is single, purchased 200 shares of Apple Inc. stock several years ago for $11,400. During her year-end tax planning, she decided to sell 100 shares of Apple for $5,200 on December 30. However, two weeks later, Apple introduced its latest iPhone, and she decided that she should buy the 100 shares (cost of $5,400) of Apple back before prices skyrocket.

What is Christina's deductible loss on the sale of 100 shares? What is her basis in the 100 new shares?