Answer:
The target variable cost per unit assuming units sold are equal to units produced is $228.571
Step-by-step explanation:
The formula to compute the target variable cost per unit is shown below:
= Target variable cost ÷ number of kayaks sold
where, 
Target variable cost = Target full product cost - Fixed costs
 = $820,000 - $340,000
 = $480,000
And, the number of kayaks sold is 2,100
Now put these values to the above formula 
So, the per unit would equal to
= $480,000 ÷ 2,100
= $228.571