A company uses its direct labour workforce to make a product for which the sales price and unit cost are as follows.
$
Selling price 80
Direct materials 10
Direct labour (2 hours) 20
Variable overheads (2 hours) 4
Fixed overheads (2 hours) 30
The workforce is operating at full capacity and it is not possible to obtain any additional labour hours in the near future. A customer has asked the company to perform a special job that would require 20 hours of direct labour time.
What would be the relevant cost of diverting labour from its existing work to perform the special job for the customer?