Christina, who is single, purchased 360 shares of Apple Inc. stock several years ago for $17,640. During her year-end tax planning, she decided to sell 180 shares of Apple for $7,920 on December 30. However, two weeks later, Apple introduced its latest iPhone, and she decided that she should buy the 180 shares (cost of $8,280) of Apple back before prices skyrocket. Leave no answers blank. Enter zero if applicable.) a. What is Christina's deductible loss on the sale of 180 shares? What is her basis in the 180 new shares?