Frey, Inc. purchased a machine for $600,000 on January 2, 2017. The machine has an estimated useful life of 4 years and a salvage value of $100,000. The machine is being depreciated using the sum-of-the-years-digits method. The December 31, 2018 asset balance, net of accumulated depreciation should be Select one a $250,000 b$350,000 C$280,000 d $320,000 $450.000