Discount retailer Family Dollar Stores Inc (FDO.N), which is trying to ward off a hostile bid from rival Dollar General Corp (DG.N), said its fourth-quarter profit slid 66 percent hurt by inventory markdowns, restructuring charges and merger fees. Family Dollar, which has agreed to sell itself to smaller rival Dollar Tree (DLTR.O) for a lower cash-and-stock deal of $8.5 billion, rejected Dollar General’s $9.1 billion all-cash bid saying the offer did not address anti-trust concerns.