Three different companies each purchased trucks on January 1, 2018, for $74,000. Each truck was expected to last four years or 250,000 miles. Salvage value was estimated to be $5,000. All three trucks were driven 80,000 miles in 2018, 60,000 miles in 2019, 45,000 miles in 2020, and 70,000 miles in 2021. Each of the three companies earned $63,000 of cash revenue during each of the four years. Company A uses straight-line depreciation, company B uses double-declining-balance depreciation, and company C uses units-of-production depreciation. Answer each of the following questions. Ignore the effects of income taxes. c-1. Calculate the book value on the December 31, 2020, balance sheet?