1.Serpil's utility function is U(B,C )= B . C , where B = veggie burgers per week and C= packs of cigarettes per week.

a ) What is her marginal rate of substitution if veggie burgers are on the vertical axis and cigarettes are on the horizontal axis ?

b) Serpil's income is $120, the price of veggie burger is $2, and that of a pack of cigarettes is $1. How many burgers and how many packs of cigarette does Serpil consume to maximize her utility? Illustrate your answers in a graph.