Consider the following three individuals. Just after their 14th payment:
■ Robert Dixon had a balance of $80,000 on a 9%, 15-year mortgage;
■ Wanda Harper had a balance of $80,000 on a 9%, 20-year mortgage; and
■ Tony Zang had a balance of $80,000 on a 9%, 30-year mortgage.
How much interest did each individual pay on the 15th payment?