Answer:
Relevant cost = $19
Explanation:
Relevant cost refers to the cost which is avoidable on the addition of any other unit, here the direct cost of material, and labor $14 and variable overhead of $5 per head is avoidable straight as is related to per unit.
Further fixed cost of $8 each allocated is already incurred and not relevant for the decision for any additional unit.
Therefore, in the given case relevant cost = $14 + $5 = $19
Since that is the only avoidable cost.
Fixed cost has already been incurred and cannot be avoided.
Relevant cost = $19