InDesign (Adobe) print resolution problem By Henry's Cat on Sep 5 Max Bid: $40

InDesign Resolution Problem
We have a problem placing charts into InDesign. We can send you the original files, but I don't know how to attach them to this bid request in RAC.
Here is a description of the problem.
We want to import / place some charts into InDesign but when we export to PDF they lose their resolution. When you zoom in on the jpg files they appear to be high resolution.
I import them into InDesign and they are still high-res - I can zoom in on them and they keep their clarity, I can check the object info and see the ppi is high enough, yet when I export to PDF, I cannot zoom in more than 300% before they lose their quality.
Can anyone help? We just need some advice that solves this problem.
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