*1. Reconstruct the equipment replacement model of Example 6.3-1, assuming that a car must be kept in service at least 2 years, with a maximum service life of 4 years. The planning horizon is from the start of year 1 to the end of year 5. The following table provides the necessary data.

Replacement cost ($) for given years in operation Year acquired 1

2 3

4 5

2 3800 4000 4200 4800 5300 3

4100 4800 5300 5700 4

6800 7000 7200