On December 31, 2017, Yong sells his 10% interest in Catawissa LLC to Mei for $17,500. Yong

Question:

On December 31, 2017, Yong sells his 10% interest in Catawissa LLC to Mei for $17,500. Yong is a calendar year taxpayer. Catawissa owns no hot assets, and its tax year ends on September 30. On October 1, 2017, Yong's basis in the LLC interest was $11,000. His share of current LLC income is $4,000 for the period in which he owned the LLC interest (October 1 to December 31).
How much capital gain does Yong recognize on the sale?