Inflation, as measured by the Wholesale Price Index (WPI), stood at 9.78% in August.The rate of price rise was recorded at 8.98% in September, 2010.As per data released by the government on Friday, overall inflation in June this year was revised upward to 9.36% from the provisional estimate of 9.22%. On an annual basis, food items became 9.23% more expensive during the month under review.Onions grew 23.58 % costlier, while fruit prices were up 15.98% and the rates for potatoes rose by 14.64 %.