Associated Press: BP PLC said Monday that the Gulf of Mexico oil spill has cost the company $350 million so far as it outlined renewed efforts to contain the leak. BP said the tally included the cost of the immediate response, containment, relief well drilling, commitments to the Gulf Coast states, and settlements and federal costs. The company did not speculate on the final bill, which most analysts expect to run into tens of billions of dollars. BP shares slipped 0.5 percent to 551.4 …