On April 1, L company sells some equipment for $18,000. The original cost was $50,000, the estimated salvage value was $8,000, the expected useful life was 6 years. On December 31 of the previous year, the accumulated depreciation account had a balance of $29,400. What is the gain or loss on disposal?

I need help! I dont know how they got this answer, Can you show me the steps how to get to this! Thanks!

c.)$850 loss <---- Correct Answer