please show how to do the calculation by hand

13-34 In evaluating projects, LeadTech's engineers use a rate of 15%. One year ago a robotic transfer machine was installed at a cost of $38,000. At the time, a 10-year life was estimated, but the machine has had a downtime rate of 28%, which is unacceptably high. A $12,000 or a labor-intensive process costing $3500 in direct labor A upgrade should fix the problem, per year can be substituted. The plant estimates indirect plant expenses at 60% of direct labor, and it allocates front office overhead at 40% of plant expenses (direct and indirect). The robot has a value in other uses of $15,000. What is the difference between the EUACS for upgrading and switching to the labor-intensive process