On January 1, 2018, Margo Company acquired machinery at a cost of $160,000. This machinery was being depreciated by the double-declining-balance method over an estimated life of five years with no salvage value. At the beginning of 2020, Margo changed to and could justify straight-line depreciation. Margo's tax rate is 30 percent. What is the amount of depreciation expense to be included in 2020 net income?

$7,200

$19,200

$38,400

$24,000