To determine the variable cost per unit, you'd typically need additional information such as total variable costs and the number of units produced, or a cost structure that separates fixed and variable costs. Without the specific context from the video, I can guide you on how to calculate it.

The formula to calculate the variable cost per unit is:

$\text{Variable Cost per Unit} = \frac{\text{Total Variable Costs}}{\text{Number of Units Produced}}$

If you have the following data from the problem, plug in the values accordingly. Otherwise, you can refer back to the video for specifics like:

1. Total variable costs: The cost that changes with production level.
2. Total units produced: The number of units used to calculate per-unit cost.

Once you have these, you can determine which of the provided choices ($4.00, $5.00, $4.50, or $0.50) matches the calculation.

Do you have the total variable costs or any other relevant data to solve this?

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Questions:

1. What is the total number of units produced in this scenario?
2. What are the total variable costs given in the problem?
3. Are there fixed costs mentioned, and how are they treated in the problem?
4. Does the problem differentiate between direct material and labor costs?
5. Can overhead be considered part of the variable costs in this case?

Tip: Always ensure you're distinguishing between fixed and variable costs, as it affects unit cost calculations significantly.