Hella expert, what is the correct answer for deductible loss?

[The following information applies to the questions displayed below.] Christina, who is single, purchased 400 shares of Apple Incorporated stock several years ago for $18,800. During her year-end tax planning, she decided to sell 200 shares of Apple for $8,400 on December 30 . However, two weeks later, Apple introduced its latest IPhone, and she decided that she should buy the 200 shares (cost of $8,800) of Apple back before prices skyrocket. Note: Leave no answers blank. Enter zero If applicable. What is Christina's deductible loss on the sale of 200 shares? What is her basis in the 200 new shares