Athletic Lake has a surface area of 75.96 km2. In September, the evaporation was estimated to be 3.20 inches and the precipitation was 3.45 inches. The average flow rate of the River Tiger into the lake was determined to be 3.5 m3/s and the average flow rate of the River Yankee out of the lake was measured at 2.5 m3/s (ignore any loses due to evapotranspiration). Determine the change in storage (m3) during the month of September for this lake