5. (2 points) Mary has the following demand function for quinoa Q which depends on the price p,- of rice and the the price pg of quinoa: Q = 100 qu pr. In your analysis, assume that the prices ensure Q > O. (a) (1 point) Determine the cross price elasticity of quinoa with respect to the price of rice for general prices. (b) (1 point) Are the goods complements or substitutes