Answer:
Favorable Sales Volume Variance
Explanation:
This is an example of a favorable sales volume variance. This occurs when the actual sales are greater than the budgeted sales at any given price thus resulting in an increased total units sold.
Sales Volume variance has the following formula,
Volume Variance = Budgeted Selling Price * (Actual Units - Budgeted Units)
We do not need to calculate Budgeted selling price as the question specifies only unit difference.
Hope that helps.