RIBNA has estimated 200m3 concrete and 800 dowels to complete a concrete paving project. 60 work hours is estimated to make dowel baskets and anchor them to the base course. A slipform paver, in 40 work hours, spreads, consolidates, and finishes the concrete slab. On a study date, 600 dowels in 45 work hours and 120m3 concrete in 30 work hours are used. In the above scenario, the SPI for the project is: 0.85 unknown. more information is required. 1.15 the same as its CPI