Wool Inc purchased a machine on April 1, 2020, for $90,000, with an estimated useful life of 10 years. The machine has a residual value of $10,000. Wool Inc uses the double-declining-balance method of depreciation. What will the carrying value of this machine be on the December 31, 2021 balance sheet? a) $72,000. b) $61,200. c) $76,500. d) $18,000. e) $57,600.