P11-8 Book value and taxes on sale of assets Troy Industries purchased a new machine 3 years ago for $80,000. It is being depreciated under MACRS with a 5-year recovery period, using the percentages given in Table 4.2. Assume a 40% tax rate. a. What is the book value of the machine? b. Calculate the firm's tax liability if it sold the machine for each of the following amounts: $100,000; $56,000; $23,200; and $15,000