Please explain each step with number and logic.

A tractor for over-the-road hauling is purchased for $90,000. It is expected to be of use to the company for 6 years, after which it will be salvaged for $4,000. Calculate the depreciation deduction and the unrecovered investment during each year of the tractor's life using MACRS-GDS allowances. a. What is the MACRS-GDS property class? ANSWER b. Assume the tractor is used for the full 6 years ANSWER C. Assume the tractor is sold during the 4th year of use. ANSWER d. Assume the tractor is sold during the 3rd year of use