help!!

Please use the following MACRS table for depreciation of assets: What would be the tax shield associated with depreciation in year two for a five year asset with a depreciable base of 100,000 and a tax rate of 30% ? Problem 2 What would be the tax shield associated with depreciation in year 1 for a 50,0003 -year asset if the tax rate is 40% ? Problem 3 What would be the terminal value at the end of year four for a 5 -year asset that was purchased for 80.000 and sold at the end of year four for 20,000 if the tax rate is 20% ? Problem 4 What is the depreciable base of an asset that cost 20,000 , incurred transportation charges of 5000 , and increased working capital by 6,000