Contemporary Engineering Economics 6th Edition by Chan Park

تمرين 40

The after-tax annual equivalent worth of retaining a defender over four years (physical life) or operating its challenger over six years (physical life) are as given in Table.
TABLE 23
If you need the service of either machine for only the next eight years, what is the best replacement strategy Assume a MARR of 12% and no improvements in technology in future challengers.