The manager of Sami D's Soft Pretzels reviewed her monthly operating costs for the past year. Her costs ranged from $18,000 for 9,000 pretzels to $16,500 for 6,000 pretzels. 1. Calculate the variable cost per pretzel. 2. Calculate the total fixed costs Write the equation and then calculate the operating costs for 7,500 pretzels. 3. 4. Draw a graph illustrating your total cost under this plan. Label the axes, and show at least 3 data points before drawing your total cost line