Chapter 25, Problem E25.18E

To determine

Differential Analysis:

Differential examination includes breaking down the distinctive expenses and advantages that would emerge from elective answers for a specific issue. Significant incomes or expenses in a given circumstance are future incomes or costs that contrast contingent upon the elective strategy chose. Differential income is the distinction in incomes between two choices. Differential cost or cost is the distinction between the measures of important expenses for two options.

To determine:

Whether cool system should make the optical switch or it should buy the switch.