Mendenhall Corporation constructed a building at a cost of $10,000,000. Average accumulated expenditures were $4,000,000, actual interest was $600,000, and avoidable interest was $400,000. If the salvage value is $800,000, and the useful life is 40 years, depreciation expense for the first full year using the straight-line method is

a. $240,000. b. $245,000. c. $260,000. d. $340,000.

please explain