Question 8 10 pts Ballou Company purchased a machine on January 1, 2019, for $18,000 cash. The machine has an estimated useful life of four years and a salvage value of $2,500. The company uses the double- declining-balance method of depreciation for all its assets. What will be the machine's book value as of January 1, 2021? $4,500 $2,500 $5,100 $4,300