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Bitcoin premium exchange rate


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$url = "https://btc-e.com/api/3/ticker/btc_usd";
$fileGet = file_get_contents($url);
$json = json_decode($fileGet, TRUE);
$json = $json["ticker"]["last"];
$premium = 5; //in percentage
$premium = $premium / 100;
$dollar_amount = $premium * $json;
$customer_price = $json + $dollar_amount;
echo $customer_price;

i was trying to display my own premiunm exchange rate.

i mean (Buy Bitcoin on my site at $.....).


 i was doing this by using the last exchange rate from btc-e.com/api/btc_usd.which was a jason.


  what i did is that i define my own percentage from there last exchange rate and i add that percentage to it.but it doesn't work.


 above is example of my code let say im working with addition of 5 percent.

please can i get a help ?



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