Brazil’s federal public debt rose 2.59% in September to 4.53 trillion reais ($800 billion) from the month before, the Treasury said on Tuesday, adding the total domestic debt stock rose 2.56% to 4.28 trillion reais. Treasury also said the average interest rate on domestic debt issues in the 12 months to September fell to a new all-time low of 4.64%, although the average cost of servicing the overall debt stock ticked up to 8.72%.