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A designer estimates that she can increase the average time between failures of a part by 5 percent of a cost of $450

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A designer estimates that she can increase the average time between failures of a part by 5 percent of a cost of $450. Currently, the average time between failures is 100 hours and the average repair time is 4 hours.

B. A designer estimates that she can reduce the average repair time by 10 percent at a cost of $200. Currently, the average time between failures is 100 hours and the average repair time is 4 hours.

C. What option would be more effective?