Imagine the following scenario: a software engineer earns $100/hr. A given simple project requires a set of 100 unit tests. Each unit test takes an average of 3 minutes for the engineer to write. If automated, the unit tests take a total of 1 minute to run. If the tests are executed manually, the unit tests take a total of 10 minutes to run. How many times must the set of unit tests be run in order for the time savings they offer throughout the lifetime of the project to compensate for the up-front cost of their creation
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