How do you answer this economic- Consumer and Utility question?

Question

Mr. Rational Consumer goes out to lunch and get 45 marginal utils for the last slice of pizza and 40 marginal utils for the last glass of beer. He is paying $1.10 for each pizza and $0.90 for each glass of beer. What is the optimum mix of the commodities? if he is not getting the highest utility, how is he going to change his combination of pizza and beer?

Someone please help me because I think the answer is not enough information but the professor said there is an answer and not enough info is not the right answer. Thanks

Answer 1

Unless you can buy fractions you can't do anything.