Biden suggests he will raise taxes on the nation's billionaires by up to 25%.

Washington, Mar 11- The president of the United States, Joe Biden, suggested Monday that he will increase taxes on the richest people in the country from 8.2% on average that they pay now to 25%, which would raise 400,000 million dollars in ten years, while he pledged that "never" cut social security or' Medicare'. "Even Trump said this morning that cuts in Social Security…