Cost per page while using Gemini Flash 1.5

Gemini API
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1

Hi, We have

  1. Considering 1 PDF page has about 700 tokens, how much it would cost if we have about 100 pages in Gemini Flash 1.5.
  2. Does after API integration data will go out of our environment? Or will it remain within our application. We want no RAG responses.
  3. How many responses can we generate over 100 pages assuming each PDF has 700 tokens.
  4. At what point cost will be applicable and how much it would be.