Need help trying to answer the questions below the table?

I understand that to get: Contribution Margin = Sales Price per unit - Variable Cost per unit ... but what is meant by the "cost-volume-profit analysis"??

Contribution Margin

Contribution Margin Analysis
	COLLARS		LEASHES		HARNESSES
Sales Price per Unit	$ 20.00		$ 22.00		$ 25.00
Variable Cost per Unit	9.10		12.10		14.60
Contribution Margin	$ 10.90		$ 9.90		$ 10.40

[Share and explain your contribution margin per unit. How did you arrive at these numbers? Be sure to reference your cost-volume-profit analysis in your defense.]

Thanks in advance for any help you can provide!!