Which one of the following is an example of a sunk cost? 20 Multiple Choice $1,500 of lost sales because an item was out of stock. $1,200 paid to repair a machine last year. $20,000 project that must be forfeited if another project is accepted. $4,500 reduction in current shoe sales if a store commences selling sandals $1,800 increase in comic book sales if a store ceases selling puzzles