15. Equipment was purchased for $45,000. Freight charges amounted to $500 and there was a cost of $2,500 for building a foundation and installing the equipment. It is estimated that the equipment will have a $8,000 residual value at the end of its 5-year useful life. Depreciation expense each year using the straight-line method will be: $9,600. $8,000. $9,000. $7,400.