(c) A composite material consists of 15 kg of material A, 10 kg of material B and 5 kg of material C. The densities of materials A, B and C ara 2 g/cm, 3 g/cm and 4 g/cm, respectively. (i) Calculate the weight percentages of material A, material B, and material C in the composite. [3 marks] (ii) Determine the average density of the composite in g/cm. [4 marks] (iii) Calculate the modulus of elasticity of the composite in GPa. The modulus of elasticity of material A, B and C are 10 GPa, 25 GPa and 76.9 GPa, respectively. [3 marks]