On December 31, Strike Company sold one of its batting cages for $27,000. The equipment had an original cost of $270,000 and has accumulated depreciation of $243,000. Depreciation had been recorded up to the end of the year. What is the amount of the gain or loss on this transaction?

A. Gain of $27,000

B. Gain of $486,000

C. no gain or loss

D. cannot be determined