assume that he cannot purchase fractional units. He has already purchased one of each fora total of $30, so he has $70 left. Since he wants 3 more DVDs, he can buy these for $60 and spend his remaining $10 on 1 CD. This is the first bundle below. He could also choose to buy only 2 DVDs for $40 and spend the remaining $30 on 3 CDs. This is the second bundle. Finally, he could purchase 1 more DVD for $20 and spend the remaining $50 on the 5 CDs he would like. This is the final bundle shown in the table below.
