who determines the price of gold in my country which it is out of the united states?

Answer 1

The same as everywhere else, the price other people are willing to pay for it.

Answer 2

Gold is bought & sold on different commodity markets, in large amounts worldwide.
The price is supposed to be regulated by supply & demand.
It is called the "Spot" price of Gold.
This site tracks the spot price for 5 days during business hours:

http://www.kitco.com/charts/livegold.html

However the spot price is also the wholesale price, and smaller dealers may buy or sell at lower or higher prices. Gold coin dealers must mark up prices to operate their business at a profit.
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Answer 3

Gold is traded in international markets and usually priced in $. so the price in your currency would be determined by the exchange rate of your currency with the dollar and the market price.
http://www.kitco.com/market/