Very much agree with my fellow coaches i.e., limit your questions to understanding the problem at that point. What I would like to add is this: Have the confidence to do as you deem right for solving the problem.
Candidates often ask the most basic things instead of showing some confidence and owning the process it. e.g., “do we need xyz”, “should we do abc”, “is it OK to round this number”, etc. Your questions fall into that category.
This doesn't mean that you should be resistant to being steered and by pushy, both of which happens sometimes and is really bad. However, it's equally bad when a candidate is asking the interviewer everything as if this were an exam and a conversation between pupil and professor. The case interview is not an exam (at least you shouldn't think of it as one). It's an eye-to-eye conversation between two professionals about solving a problem. This is the mindset you should get into!
Hope this helps a bit. Best of luck!