7-5. A new barcode reading device has an installed cost basis of $24,750 and an estimated service life of seven 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 seven? b. What is the book value at the end of year six? c. What is the gain (or loss) on the disposal of the device if it is sold for $800 after six years?