Answer the question on the basis of the following marginal utility data for products X and Y. Assume that the prices of X and Y are $4 and $2, respectively, and that the consumer's income is $18. 
What level of total utility will the utility-maximizing consumer realize?
Definitions:
Coupon Rate
The interest rate paid yearly on a bond, represented as a percentage of its par value.
Zero Coupon
A bond or debt security that does not pay interest (a coupon) but is traded at a deep discount, providing profit at maturity when the bond is redeemed for its full face value.
Yield
The income return on an investment, such as the interest or dividends received, expressed as an annual percentage of the investment cost.
Original Maturity
The fixed term length at the issuance of a bond or other fixed-income security until it reaches its due date for the repayment of the principal.
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