as shown in column 4 of table 2-1, the net present worth of the benefits of paving beginning at a level of 400 vehicles a day amounts to rs829000 amile when discounted at 12 percent. column 5 indicates that the benefits amount to rs669,000 if the traffic level in the base year is 369 vehicles. since paving costs are estimated at rs750,000. paving becomes justified when the traffic level reaches 380-390 vehicles a day in the base year, at that traffic level the internal rate of return is 12 percent