Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 8 - Personal Finance - 8.7 The Cost of Home Ownership - Exercise Set 8.7 - Page 556: 8

Answer

The mortgage option that has greater total cost is \[\text{Mortgage A}\]and by\[\$53,910\]. For option A: First of all, compute the value of the one point by multiplying the amount of mortgage with the one point, use the equation as shown below: \[\begin{align} & \text{One point Amount}=\text{Mortgage Amount}\times 0.011 \\ & =\$250,000\times0.01\\&=\$\text{2,500}\end{align}\] The one point amount in option A that needs to be paid at the closing is $2,500. Now, it is required to compute the monthly payment value for the $250,000 mortgage at 7.25% for 30 years. Compute the monthly payment by substituting the values in the loan payment formula as shown below: \[\begin{align} & PMT=\frac{P\left( \frac{r}{n} \right)}{\left( 1-{{\left( 1+\frac{r}{n} \right)}^{-nt}} \right)} \\ & =\frac{\$250,000\times\left(\frac{0.0725}{12}\right)}{1-{{\left(1+\frac{0.0725}{12}\right)}^{-12\times30}}}\\&=\frac{\$250,000\times\left(0.00604\right)}{1-{{\left(1+0.00604\right)}^{-360}}}\\&=\$1,706\end{align}\] In order to calculate the interest amount that will be paid in 30 years, subtract the amount of total monthly payments with the amount of mortgage, use below equation:

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