Billie Joe loves Krispy Kreme donuts and coffee. Billie Joe likes to eat 3 donuts (D) for each cup of coffee (C) he drinks. His utility function is: U = min(0.333D, C).
a. Draw three indifference curves for Billie Joe, where I3 \succ I2 \succ I1
b. The price of each donut is $0.60 and the price of coffee is $2.20. Given Billie Joe has $40 in income, find his optimal bundle of coffee and donuts.