a. Using straight-line depreciation, what is the book value after five years for an asset costing $120,000 that has a salvage value of $25,000 after 10 years? What is the depreciation charge in the sixth year? b. Using declining-balance depreciation with d = 25 percent, what is the book value after five years for an asset costing $120,000? What is the depreciation charge in the sixth year? c. What is the depreciation rate using declining balance for an asset costing $120,000 and having a salvage value of $25,000 after 10 years? a. The book value after five years using straight-line depreciation is $ (Round to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) The depreciation charge in the sixth year using straight-line depreciation is $ (Round to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) b. The book value after five years using declining-balance depreciation is $ (Round to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) The depreciation charge in the sixth year declining-balance depreciation is $ (Round to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) c. The depreciation rate using declining balance is percent. (Round the final answer to one decimal place as needed. Round all intermediate values to six decimal places as needed.)