Select the most correct answer: A manufacturer purchased and installed a machine 4 years ago at a cost of $4,000. A new machine is now needed, and one is available for $7,000 less a $1,000 trade-in allowance for the old machine. The market value of the old machine with out trade-in on a new model is $300. Which one of the dollar values is a sunk cost? Choose... A manufacturer purchased and installed a production machine 2 years ago at a cost of $60,000. Since then the machine has been depreciated for tax purposes to a value of $9,000 and it now requires replacement. A new machine will be purchased for $40,000 and the old machine sold to a used equipment dealer for $7,000. Which one of the dollar values is a book cost, not an actual cash transaction? Choose