1. Stating the problem: Calculate the total cost for each raw material given the cost per kg and amount used per year, then find the total cost of all materials combined. 2. Calculate total cost for each raw material using the formula: $$\text{total cost} = \text{cost per kg} \times \text{amount per year (kg)}$$ - Used oil: $$1.20 \times 175.1558887 = 210.18706644$$ - Xanthum gum: $$2.00 \times 2.977650109 = 5.955300218$$ - Potassium hydroxide: $$3.40 \times 19.96777132 = 67.89132149$$ - Orange peels: $$0.52 \times 875.7794437 = 455.20130412$$ - Activated charcoal: $$5.80 \times 83.89967071 = 486.61769012$$ - Citric acid: $$5.00 \times 5.254676662 = 26.27338331$$ 3. Sum all the total costs to find the overall total cost: $$210.18706644 + 5.955300218 + 67.89132149 + 455.20130412 + 486.61769012 + 26.27338331 = 1251.1260657$$ 4. Therefore, the total annual cost for all raw materials is approximately $$1251.13$$.