Barnes and Noble purchased a bookshelf for $40,000 with a salvage value of $4,000 and a life of 8 years, after 6 years of use, they sold the bookshelf for $14,000 cash. Using straight-line depreciation, what was the book value after 6 years? Was there a gain or loss on the sale and what was the amount of gain or loss? Please make a journal entry for the sale of the shelf.