Consider the following sample of production volumes and total cost data for a manufacturing operation.

Production Volume (units)	Total Cost ($)
400	4,000
450	5,000
550	5,400
600	6,000
700	6,300
750	7,100

Use these data to develop an estimated regression equation that could be used to predict the total cost for a given production volume

What is the variable cost (in dollars) per unit produced?

Compute the coefficient of determination. (Round your answer to three decimal places.)

What percentage of the variation in total cost can be explained by production volume? (Round your answer to one decimal place.)

The company's production schedule shows 500 units must be produced next month. Predict the total cost (in dollars) for this operation. (Round your answer to the nearest cent.)