Sue, of Sue’s Sandwiches, sells sandwiches and soda from a sidewalk cart in a popular park near her house. She sets up her cart in the summers to earn money for college tuition. Last month she sold...

Sue, of Sue’s Sandwiches, sells sandwiches and soda from a sidewalk cart in a popular park near her house. She sets up her cart in the summers to earn money for college tuition. Last month she sold $1,240 worth of product (sandwiches and sodas) to 100 customers. She spent $210 on the sandwich ingredients and buying the sodas wholesale. Her unit is one sandwich ($4) plus one soda ($1). Define the unit of sale and calculate the economics of one unit for Sue’s Sandwiches.