The phone bill for a Law Firm is a mixed cost. The costs for a four-month period are shown below: Minutes Total Bill Jan Feb Mar Apr Problems #11: 600 550 400 450 $5,800 $5,350 $4,000 $4,450 Using the High-Low Method, calculate variable cost per minute?

The phone bill for a Law firm is a mixed cost. The costs for a four-month period are shown below: Problems \#11: Using the High-Low Method, calculate variable cost per minute