Q 124# John consumes two goods,X and Y.The marginal utility of X and the marginal utility of Y satisfy the following equations:
MU

# John consumes two goods,X and Y.The marginal utility of X and the marginal utility of Y satisfy the following equations:
MU_{X} = Y MU_{Y} = X.
The price of X is $9,and the price of Y is $12.
a.Write an expression for John's MRS.
b.What is the optimal mix between X and Y in John's market basket?
c.John is currently consuming 15 X and 10 Y per time period.
Is he consuming an optimal mix of X and Y?

Essay