Ava is a filing clerk at a large insurance company, she is permitted to leave the premises for lunch, but usually eats in the companys cafeteria because it is quik and she is on a tight schedule. On average, she pays $2 for a lunch that would cost $12 at a restaurant. However if she prices in the cafeteria were not so low and the food as not so delicious, she would probably bring her lunch at a cost of $3 per day.