a. (4 marks) The mass distribution by particle size for the feed is given by the following table. Determine the P80. Show your working, sketch the graph along, and give your answers to the nearest microns. Product Screen size (um) Mass Retained (g) 250 80 230 150 175 125 125 85 75 35 50 49 b. (1 mark) If the product screen size (S) is 170 um, average net grams/ revolution (G) is 1.23 g/rev and F80 = 2800 um. Calculate the Bond work Index (W) in kWh/t, C. (1 mark) Estimate the energy requirement if F80 = 160 um and P80 = 10 um a. (4 marks) The mass distribution by particle size for the feed is given by the following table. Determine the P80. Show your working, sketch the graph along, and give your answers to the nearest microns. Product Screen size (um) Mass Retained (g) 250 80 230 150 175 125 125 85 75 35 50 49 b. (1 mark) If the product screen size (S) is 170 um, average net grams/ revolution (G) is 1.23 g/rev and F80 = 2800 um. Calculate the Bond work Index (W) in kWh/t, C. (1 mark) Estimate the energy requirement if F80 = 160 um and P80 = 10 um