10. [Depreciation] BBB has recorded straight-line depreciation on a machine for 4 years that BBB purchased 4 years ago for $80,000. The expected salvage value of the machine is $8,000 at the end of its estimated useful life of 6 years. The tax rate for BBB is 30% A) Compute the annual depreciation expense under the straight-line depreciation method. 2 B) Compute the cumulative depreciation expenses of the machine. C) Compute the current net book-value of the machine