Allow the change of currency

I need the same.

Just override this function on your PHP template.

/**
 * Theme: Total value for a currency amount
 */
function theme_views_summarize_type_currency($variables) {
  $data = $variables['data'];
  $total = 0;
  foreach ($data as $val) {
    $total += (float) preg_replace('/[^0-9\.]/', '', $val);
  }
  return '<div class="label">' . t('Total:') . '</div>' .
    sprintf('$%.02f', $total);
}

I've used something like

  foreach ($data as $val) {
    $total += (float) preg_replace('/[^0-9\.]/', '', $val);
		$symbol = preg_replace('/[0-9\. ]/', '', $val);
  }

And then used $symbol down below on the return.

  $ret  = '<div class="summarize-label">' . t('Total:') . '</div>';
  $ret .= '<div class="summarize-value">' . $symbol .' '. sprintf('%.02f', $total) .'</div>';

This works, as long as the fields to be added up are rendered with a currency symbol.

Marked #1545574: Prefix or suffix not compatible with total count OR add a currency parameter as a duplicate.

I'm not sure how far I want to go with this, but I was thinking that and admin settings page, where you could specify all the deatails of how you want your numbers displayed, might give everyone exactly what they want.

Please check this http://drupal.org/node/1876548

Perhaps this could be done with Currency API? There is a patch in #1876548: Changes for presentation logic of views summary for sites with Commerce available.

There is a patch that fixes this in the following issue: #1876548: Changes for presentation logic of views summary