Bridget has a limited income and consumes only wine and cheese; her consumption choice is four bottles of wine and 10 pounds of cheese. Wine is $10 per bottle and cheese is $4 per pound. The last bottle of wine added 50 units to Bridget's utility, while the last pound of cheese added 40 units.
a. Is Bridget making the utility-maximizing choice? Why or why not?
b. If not, what should she do instead, why?