Final answer:
Food availability and the cost of raw materials are two independent variables that can affect the cost of salad at a restaurant.
Step-by-step explanation:
The two independent variables that could affect the cost of salad at a restaurant are food availability and the cost of raw materials.
Food availability refers to the availability of seasonal ingredients and their prices. For example, if a particular vegetable or fruit is in high demand and scarce during certain seasons, it can increase the cost of salad as restaurants have to pay more to source those ingredients.
The cost of raw materials, such as vegetables, dressings, and other ingredients used in the salad, can also impact the overall cost. If the prices of these raw materials increase, the cost of salad would also increase to cover these expenses.