What are some challenges that managers will face if costs are not managed and controlled?

Respond with 300 minimum words
APA formatting
Citation Requirement: Minimum of 1 – 2 scholarly, peer-reviewed source properly cited and referenced.
Assume you are a manager for a restaurant.
Identify a fixed and variable cost in the restaurant industry and explain how the costs might affect a restaurant’s profit, efficiency, and economic sustainability.
How can a restaurant control the identified fixed and variable costs if the business starts to experience a decline or growth in sales?
What are some challenges that managers will face if costs are not managed and controlled?