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 on page 000. Assume a 40% tax rate. a. What is the book value of the machine? b. Calculate the firms tax liability if it sold the machine for each of the following amounts: $100,000; $56,000; $23,200; and $15,000.