On July 1, 2011, Mazaya Company places a new asset into service. The cost of the asset is R.0.80,000 with an estimated 5-year life and R.O.20,000 residual value at the end of its useful life. What is the book value of the plant asset on the December 31, 2011, statement of financial position assuming that Mazaya Company uses the double-declining-balance method of depreciation? Select one: a. R.0.48,000 b. R.0.72,000 c. R.0.64,000 d. R.0.62,000