Question: On January 1, 2017, Betty DeRose, Inc. purchased a piece of machinery for $170,000. The machine had an estimated useful life of 10 years and a salvage value of $5,000. Assume Betty DeRose depreciates its assets using the sum-of-the-years-digits' method of depreciation. Calculate the book value of the machine at December 31, 2019. Do not use decimals in your answer.