btrx

$rsEl = CIBlockElement::GetList(array("ID" => "ASC"), array("IBLOCK_ID" => $BID, ">ID" => $_REQUEST["lastid"]), false, array("nTopCount" => $limit));
    while ($arEl = $rsEl->Fetch())
    {
        if($arEl["IBLOCK_SECTION_ID"] == 169 || $arEl["IBLOCK_SECTION_ID"] == 170){
            $ar_res = CPrice::GetBasePrice($arEl["EXTERNAL_ID"]);
            $newprice = $ar_res["PRICE"] + $ar_res["PRICE"]*50/100;
            $newprice = number_format($newprice, 2, '.', '');
            #printr($ar_res);
            CPrice::SetBasePrice($ar_res["ID"], $newprice, "RUB");
            $lastID = intval($arEl["ID"]);
        }else{
            $ar_res = CPrice::GetBasePrice($arEl["EXTERNAL_ID"]);
            $newprice = $ar_res["PRICE"] + $ar_res["PRICE"]*30/100;
            $newprice = number_format($newprice, 2, '.', '');
            #printr($ar_res);
            CPrice::SetBasePrice($ar_res["ID"], $newprice, "RUB");
            $lastID = intval($arEl["ID"]);
        }
    }