A company purchases a salesman a car for $40,000; the salesman pays $2,000 for an upgraded sound system to make his time on the road more pleasant. The car has an expected salvage value of $2,000 and an expected life of 4 years or 200,000 miles.

During the first year the car was driven 45,000 miles, during the second year 40,000 miles and 50,000 miles the 3rd year

Please show the annual depreciation expense for years 1, 2, 3 using straight line depreciation, double declining balance method, and units of production method. For each method, show the car's book value at the end of year 3.