I have 35 minutes and the answer are very sensitive,please write the answer fully and correctly carefully . thank you

A new barcode reading device has an installed cost basis of 24,850 and an estimated service life of seven years. It will have a zero salvage valu 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 $4,000 after six years? a. The depreciation charge in year seven will be $(Round to the nearest dollar) b. The book value at the end of year six is $(Round to the nearest dollar) on the disposal of the device if it is sold for 54,000 after six years is $(Round to the nearest dollar) c. The Time Remain of 6 (0 complete) T ave a zero salvage value at that time. The 150% declining balance method is used to depreciate this asset