South African households are coming under renewed financial pressure after the country's central bank raised interest rates by 25 basis points to 7.25 percent.The move follows a rise in annual consumer inflation to 4.4 percent in August, with the South African Reserve Bank warning that higher fuel prices could add to inflationary pressures. The increase takes the prime lending rate to 10.75 percent, making borrowing more expensive for households and businesses.Our economics reporter, Innocent Semosa, looks at what's behind the decision and what it means for consumers and the wider economy.