Portugal's borrowing costs have jumped to the highest level since the adoption of the euro amid uncertainty about whether the government can cut the country's debt levels. The interest rates on Portuguese 10-year bonds leaped to 6.5 percent Monday from 6.05 percent at the start of the day. The rise came two days before a planned bond issue which aims to raise up to (EURO)1 billion. The center-left Socialist government is currently preparing next year's state budget which it says will slash the budget deficit to 4.3 percent of gross domestic product. The government says its austerity plan will reduce the budget deficit to 7.3 percent this year from 9.3 percent in 2009. 