A company has contracted to buy a new machine costing $$515000$ and will receive a trade$-$in value of $$125000$ for the old machine which has a book value of $$54000.$ To maintain the machine the company must either recruit two staff at an estimated annual salary of $$24000$ each, or retrain two of the existing workforce at a tolal cost of $$18000.$ If existing staff are used, two new recruits would need to be hired at a cost of $$16000$ each. The factory manager, whose annual salary is $$60000,$ estimates that $20\%$ of his time would be spent supervising the three new recruits and $55\%$ of his time would be spent supervising the new maintenance staff, whether they are newly hired or internally trained.

What is the total relevant cost of this decision?