Over the past 40 years, interest rates have varied widely. The
rate for a 30-year mortgage reached a high of 14.75% in July 1984,
and it reached 4.64% in October 2010. A significant impact of lower
interest rates on society is that they enable more people to afford
the purchase of a home. In the following exercise, we consider the
purchase of a home that sells for $125,000. Assume that we can make
a down payment of $25,000, so we need to borrow $100,000. We assume
that our annual income is $43,000 and that we have no other debt.
Assume that property taxes plus insurance total $250 per
month.
What is the difference in the amount we can borrow between the high
and low rates mentioned above? (Round your answer to the nearest
dollar.)
Given, remaining amount after down payment = $100000
High interest rate = 14.75%
Low interest rate = 4.64%
Now, the amount to be borrowed monthly with high interest rate = ${100000+[100000*14.75/(12*100)]}
And, the amount to be borrowed monthly with low interest rate = ${100000+[100000*4.64/(12*100)]}
Therefore, the difference in the amount that can borrow between the high and low rates is =
${100000+[100000*14.75/(12*100)] - 100000-[100000*4.64/(12*100)]}
= $[100000*{(14.75-4.64)/1200}]
= $[100000*10.11/1200]
= $842.5
$842
Hence, the required difference is $842.
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