Perform the following calculation. Show all of your work. If the grasses on a 100-hectare area of grassland grow at an average rate of 1 cm/day, the average volume of grass that is added to the grassland each day is m3. If the density of the grasses that grow in the grassland averages 400 kg/m3, the net primary productivity is approximately g/day or g/year. 1 hectare = 10,000 m2