Need matlab solution

I. = 1 An aqueous suspension which is a product of a digestion process on bauxite purification contains 10 % solid by weight. Test show that this suspension can be filtered directly to produce a product containing 65 % solids or may be thickened to various percent solids (up to 40%) using thickeners/ settling tanks before filtering to produce the same 65% solid concentration. The daily production of 10% solid aqueous suspension to be thickened and filtered is 110,000 kilograms for continuous operation of 8760 hours per year. Suitable continuous thickeners cost P11,000.00 per m2 and with life estimated at 12 years. The area required to obtain thickeners discharge of various concentration has been found to vary empirically as follows: AT 100 (S 0.01) 3 in m2/ (metric ton /day) where At is the area per ton of feed per day and S is percent solid content of the discharge from the thickener expressed as a fraction. The direct cost for thickening are P2.20 per metric ton feed regardless of discharge concentration. The thickened suspension from the thickeners is being fed continuously to the filter press. The filter presses initial costs are estimated at P 37,600.00 per m2 of filtering area and estimated to have 5 years service life. The cost of filtration is estimated a P 27.50 per metric ton of slurry fed to the filter. Data on filtration runs show that filtering area required for constant pressure operation for slurry containing 10 to 65% solids are as follows: AF 30 (1 - S) 2 , in m2 where AF is the filtering area while S is the same above. What is the optimum solids content of the slurry (S) fed to the filter press b. Minimum annual cost of the combined operation of the thickener and filter press If the selling price of the 65% solid (thickened and filtered) product is P10.00 per kilogram, determine % ROI of the said investment based on the optimum operating condition. a. C. 3