How to get product Tire / Final / Group price custom in Magento

How to get product Tire / Final / Group price custom order in Magento

$productid = 4108;
$qty = 3;
$customergroup = 1;
$_productB = Mage::getModel('catalog/product')->load($productid);
$_productB->setCustomerGroupId($customergroup);
echo $_productB->getPriceModel()->getFinalPrice($qty, $_productB);exit;