on january 1 a company purchased a machine for $40,000,000. The corporation expects to use the machine for 24000 hours overs the next six years. The estimated residual value of the machine at the end of the sixth year id $40,000. The corportiaon used the machine fo r3600 hours in 2017 and 5000 hours in 2018. What is the depreciation expense for 2017 and 2018 if the corporation uses the double decliniung balance method of depreciation?