13. Quigley,Inc.purchased a machine 4 years ago for $800,000.The machine is being depreciated on a straight-line basis to a salvage value of zero over its estimated useful life of 10 years.What is the annual depreciation expense on this machine? $800,000 $1,000,000 $80,000 $900,000 None of the other answers in this list are correct $70,000 $60,000 $700,000