Hawthorn Pty Ltd presently makes 20 000 units of a certain part to use in production. The cost to make the part is $20 per unit including $15 in variable costs and $5 in fixed overhead applied. If Hawthorn buys the part from a supplier, the cost would be $18 per unit and the released facilities could not be used for any other activity. 88.9% of the fixed overhead would continue. Determine the total relevant costs to make the part.