XYZ Machining Inc. is considering the purchase of a small truck car at a cost of $18,000. The truck is expected to have a service life of eight years and a salvage value of $2,500. Develop the complete depreciation schedule for the truck showing year-by-year depreciation charges and book values, and determine the present worth of all the depreciation charges assuming an interest rate of 10% per year, using: (a) MACRS depreciation, (b) DDB depreciation.