solve immediately please step by step

A group of fresh industrial engineering graduates in the Sultanate of Oman are starting their own business, specializing in the production of two types of metal ingots, I and II. They are eager to apply what they learned in their Theory of Modeling and Optimization course to solve a real-world problem. The graduates operate a foundry that smelts steel, aluminum, and cast-iron scraps. The ingots have specific limits on the aluminum, graphite, and silicon contents. To meet these specifications, aluminum and silicon briquettes may be used in the smelting process. The problem is to determine the optimal blending of input materials that satisfies the demand requirements at minimum cost. This involves deciding how much of each input material to use in the production of each type of ingot