15 million dollars
10-1000 USD depending on specifics
Made in Czechoslovakia, Brno is now in the Czech Republic.
some are, some are not. That is a make of rifle, not a model.
I do not have a historical price listing for the exact rifle you asked about, but in general, the BRNO rifles tend to be fairly high dollar- as with ANY firearm, value is driven by exact model and condition. I would urge you to get a face-to-face evaluation from a dealer or gunsmith familiar with these rifles. Sorry- wish I could give you a specific value, but just do not have much info on these in my reference library.
From my experience, BRNO rifles are very nice. They are no longer made under the name BRNO, but CZ, and although the manufacturing processes may have changed, the CZs are near identical to their BRNO ancestors. Try to get a BRNO model 2.
50-500 usd
Assuming you mean a Brno 602, it will depend on the caliber that the rifle is made in. Brno 602 is a make and model, not caliber.
The value of a Savage Sporter 22 long rifle is between $150 and $300 on average. The actual value varies greatly based on the rifle's condition.
50-100 usd
You will have to contact the factory.
You need to talk to a gunsmith.