You want to buy a house that costs $140,000. You have $14,000
for a down payment, but your credit is such that mort- gage
companies will not lend you the required $126,000. However, the
realtor persuades the seller to take a $126,000 mortgage (called a
seller take-back mortgage) at a rate of 5%, provided the loan is
paid off in full in 3 years. You expect to inherit $140,000 in 3
years, but right now all you have is $14,000,...