Assume a consumer can buy two goods, A and B, and that the prices are Pa and Pb respectively. The marginal utility of A is MUa and that of B is MUb. Which of the following expressions represents consumers' optimum utility maximization?
a. MU=MUbb. MUa × PA=MUb × Pbc. Pa/Pb=MUa/MUbd. PA × PB=MUa × Mube. MUa/MUb