Spiro Corp. uses the sum-of-the-years' digits method to depreciate equipment purchased in Janaury 2015 for $20,000 The estimated salvage value of the equipment is $2,000, and the estimated useful life is four years. What should Spiro report as the asset's carrying amount as of December 31, 2017? O $4,500 $1,800 O $2,000 $3,800