el metal es 92.5% plata / el metal es 92,5% plata

In one place I'm hearing "coma" while elsewhere I'm hearing "punto". Does the punctuation vary between countries in Latino America? - 10 000,00? - 10,000.00? - etc.

I think that Spain inverts commas and decimals, as does most (or all?) countries in Europe. Supposedly, Mexico and some Central American countries use the same convention as the US, but South American countries use the European/Spanish style. If true this would make sense, since countries closer to the US are more likely to be affected by our way of doing things. I am wracking my brain to remember how numbers were punctuated in Cuba. I looked at the receipts from when I changed currency in Havana and they have the same punctuation as ours. The only other reference I have is a magazine I...uh...appropriated from the airplane back to Miami. Large numbers in the magazine have a space. How's that for treading middle ground?

No worries, those inflight magazines are giveaways. But hey, if things do go south for you in Cuba when you visit in December, can I have your Rocket Spanish points? ;-)