Fuller Industries is considering replacing a machine that is presently used in its production process. Which of the following amounts represents a sunk$$ cost$?$

$$

Old

Machine

Replacement

Machine

Original cost

$ $70$ comma $000$$$70,000$

$ $46$ comma $000$$$46,000$

Remaining useful life in years

$55$

$55$

Current age in years

$55$

$00$

Book value

$ $33$ comma $000$$$33,000$

$$

Current disposal value in cash

$ $9$ comma $000$$$9,000$

$$

Future disposal value in cash$($in $5$ years$)$

$ $0$$$0$

$ $0$$$0$

Annual cash operating costs

$ $7$ comma $000$$$7,000$

$ $4$ comma $500$$$4,500$