5. Cox Construction, a company in its 10th year of business, purchased a piece of equipment on April 1, year 9, for $20,000. Cox has used it for business purposes since the initial purchase date. The company depreciated the equipment using the MACRS half-year table for 5-year assets. For tax purposes, what is the amount of accumulated depreciation expense for the equipment as of December 31, year 10? a. $6,000 b. $10,400 .$11,600 d.$12,800