To find the total variable cost, you're on the right track by thinking about multiplying cost per unit by quantity, as this is essentially the formula. Total variable cost is calculated by taking the variable cost per unit and multiplying it by the number of units produced. So, if your variable cost per unit is $5 and you produce 100 units, your total variable cost would be $500. This makes sense because variable costs, like labor and materials, do indeed change with the level of production, so this calculation gives you a straightforward way to figure out how much you're spending on these costs for a given output.