Mazaya Company purchased equipment on January 1, 2010, at a total invoice cost of R.0.400,000. The equipment has an estimated residual value of R.0.10,000 and an estimated useful life of 5 years. What is the book value of the equipment at December 31, 2011, if the straight-line method of depreciation is used? Select one a. R.O.244,000 b.R.O.390,000 CR.0.322.000 O d.R.O.156,000