Inflation based on the wholesale price index (WPI) rose marginally to 3.75% during the week ended September 17 from 3.53% in the previous week mainly due to increase in the prices of minerals, manufactured products and non-food essential items.The government revised upward the final inflation figure to 4.33% for the week ended July 23 from the provisional level of 4.07% while the WPI stood corrected at 195 points as against the earlier estimate of 194.5 points.