Calculate and record depreciation using the method double-declining-balance Sigma Corporation, purchased a machine for $50,000 on January 1, 2001, with an estimated useful life of 5 years and a salvage value of $5,000. The machine produced 20,000 units in 2001, 15,000 units in 2002, 10,000 units in 2003, 5,000 units in 2004, and 2,500 units in 2005. Use only Excel to present your answers