3 It costs $40 to buy a telephone from a department store.

The estimated maintenance cost for each year of operation is shown in Table 14. (I can keep a telephone for at most five years.) I have just purchased a new telephone, and my old telephone has no salvage value. Determine how to minimize the total cost of purchasing and operating a telephone for the next six years.

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TABLE 14 Maintenance Year Cost ($) 1 20 2345 30 40 60 70