please help

Why would the consumer not be maximizing utility by purchasing 2 units of X, 4 units of Y, and 1 unit of Z? Assume that a consumer, Jill, spends all of her money and purchases a combination of products A and B. The MUa is 5 and the Pa is $5. The MUb is 6 and the Pb is $6. ls Jill maximizing her utility? If not, what should she do to maximize utility? Why? Assume that a consumer, Jack, spends all of his money and purchases a combination of products Y and Z. The MUy is 50 and the Py is $25. The MUz is 20 and the P2 is $5. Is Jack maximizing his utility? If not, what should he do to maximize utility? Why