A new barcode reading device has an installed cost basis of $20,810 and an estimated service life of eight years. It will have a zero salvage value at that time. The 200% declining balance method is used to depreciate this asset a. What will the depreciation charge be in year eight? b. What is the book value at the end of year seven? c. What is the gain (or loss) on the disposal of the device if it is sold for $4,000 after seven years? a. The depreciation charge in year eight will be $(Round to the nearest dollar.) b. The book value at the end of year seven is $(Round to the nearest dollar.) c. The on the disposal of the device if it is sold for $4.000 after seven years is $(Round to the nearest dollar.)