How to remove decimal price in magento

just need to edit core file of Magento app\code\core\Mage\Directory\Model\Currency.php

or you can create a file in local folder

Find the following :

 public function format($price, $options=array(), $includeContainer = true, $addBrackets = false)

    {

        return $this->formatPrecision($price, 2, $options, $includeContainer, $addBrackets);

    }

Replace with:
 public function format($price, $options=array(), $includeContainer = true, $addBrackets = false)
    {

        return $this->formatPrecision($price, 0, $options, $includeContainer, $addBrackets);

    }