How can show different prices with the same currency for many countries?

Hi,
How can I show different fixed prices with the same currency for many countries?

For example, if I have the $ us dollar assigned for El Salvador, Panama, and Nicaragua.
How can I change the fixed price in dollars for a product depending on the country they come from?
For example, the same product has different prices with the same currency: $10 dollars for El Salvador, $12 dollars for Panama, and $15 dollars for Nicaragua?

Thanks