Cost Benefit Metrics

In R studio while calculating Cost Benefit metrics, I'm getting 3 different answers, not sure which is correct. Can anyone give inputs ?

I'm having trouble following your question and I suspect others might as well.

I encourage you to review the following guide, FAQ: Tips for writing R-related questions.
For example, the guide emphasizes asking coding questions with a reprex . You may have noticed that many people here request issues come in the form of a minimal reprex , that's because asking questions this way saves answerers a lot of time helping you get your issue resolved, reducing the number of back-and-forths requires.

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