Most of the concrete used in the construction of buildings, roads, dams, and bridges is made from port land cement, a substance obtained by pulverizing the hard, granular residue (clinker) from the roasting of a mixture of clay and limestone and adding other materials to modify the setting properties of the cement and the mechanical properties of the concrete. The charge to a port land cement rotary kiln contains 17% of dried building clay (72 wt% S1O₂, 16% A1₂O₃, 7% Fe₂O₂, 1.7% K₂O, 3.3% Na₂O) and 83% limestone (95 wt% CaCO₃, 5% impurities). When the solid temperature reaches about 900°C, calcinations of the limestone to lime (CaO) and carbon dioxide occurs. As the temperature continues to rise to about 1450°C, the lime reacts with the minerals in the clay to form such compounds as 3 CaO∙SiO₂, 3 CaO∙Al₂O₃, and 4 CaO ∙ A1₂O₃ ∙ Fe₂O₃. The flow rate of CO₂ from the kiln is 1350 m³/h at 1000°C and 1 atm. Calculate the feed rates of clay and limestone (kg/h) and the weight percent of Fe203 in the final cement.