Which one of the following is an example of sunk cost? $3,500 paid to a marketing consultant to help decide whether or not to start a new product line $1.5 million building used for a project that would rent for $100,000 otherwise $150,000 machine if a company starts a new project $4,500 reduction in comic book sales if a store commences selling comic movies $1,800 increase in comic book sales if a store commences selling puzzles