Required: 1. Calculate the book value of a three-year-old machine that has a cost of $31,000, an estimated residual value of $1,000, and an estimated useful life of five years. The company uses straight-line depreciation. 2. Calculate the book value of a three-year-old machine that has a cost of $55,000, an estimated residual value of $5,000, and an estimated useful life of five years. The company uses double-declining-balance depreciation. Round to the nearest dollar. 3. Calculate the book value of a three-year-old machine that has a cost of $26,000, an estimated residual value of $1,000, and an estimated useful life of 50,000 machine hours. The company uses units-of-production depreciation and ran the machine 3,200 hours in Year 1; 7,050 hours in Year 2; and 7,500 hours in Year 3