A machine was purchased nine years ago for $60,000. At the time of the purchase, the machine was expected to have a useful life of fifteen years and straight-line depreciated to zero salvage value at the end of its useful life. The machine is being sold today for $20,000, and the corporate tax rate is 40%. What is the after-tax salvage value from the sale?

Group of answer choices $20,000 $21,600 $24,000 $18,400 $36,000