Cost-volume-profit (CVP) analysis helps managers predict how changes in costs , sales volume, and selling price levels affect income.

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If this is for a sentence completion (like a test item), it is typically written as:

“Cost-volume-profit analysis helps managers predict how changes in costs and sales volume levels affect income.”

You could also see it phrased very similarly as:

“Cost-volume-profit analysis helps managers predict how changes in costs and volume levels affect income.”

Either “costs and sales volume levels” or “costs and volume levels” is standard in accounting language.