4. A machine with a five-year estimated useful life and an estimated 10% salvage value was acquired on January 1, 2011. The depreciation expense for 2013 using the double-declining balance method would be original cost multiplied by A) 40% x 40%. B) 90% x 60% x 40%. C) 60% x 60% x 40%. D) 90% x 40% x 40%