Intrawest sold one of its resorts for $5,000,000 cash in the middle of its 17th year of use. The hotel originally cost $20,000,000 and was amortized using the straight-line method with no residual value and a useful life of 20 years.

The answer is in the image but I'm really confused where the 16,500,000 came from. I need an explanation of how this works (how the accumulated depreciation was calculated and the journal entries).

Intrawest sold one of its resorts for $5,000,000 cash in the middle of its 17 th year of use. The hotel originally cost $20,000,000 and was amortized using the straight-line method with no residual value and a useful life of 20 years