Darius buys only milk and cookies.

a. In year $1$ , Darius earns $\$ 100$, milk costs $\$ 2$ per quart, and cookies cost $\$ 4$ per dozen. Draw Darius's budget constraint.

b. Now suppose that all prices increase by $10$ percent in year $2$ and that Darius's salary increases by $10$ percent as well. Draw Darius's new budget constraint. How would Darius's optimal combination of milk and cookies in year $2$ compare to his optimal combination in year $1$ ?

While analyzing Daria's facial shape you found that she has a wide forehead and a narrow chin. What facial shape does Daria have?