Final answer:
The total variable expense for Candle Central to sell 500 units is calculated by finding the variable cost per unit ($2.40) and then multiplying by 500 units, which equals $1,200. Correct answer is option 2.
Step-by-step explanation:
First, let's calculate the variable cost per unit by noting the change in total variable cost with an increase in units sold. We know that at 600 units sold, Candle Central has a total variable expense of $1,440, and for 900 units, it's $2,160. The difference in units sold is 900 - 600 = 300 units.
The difference in total variable expense is $2,160 - $1,440 = $720. Dividing the increase in variable expense by the increase in units sold gives us the variable cost per unit, which is $720 รท 300 units = $2.40 per unit.
Now we can forecast the total variable expense for selling 500 units by multiplying the variable cost per unit ($2.40) by the number of units (500), which gives us 500 units * $2.40 = $1,200. Therefore, the total variable expense for selling 500 units would be $1,200.