Explanations:
Given the following parameters:
Cost of house = $119,000
Minimum down payment = 15%
Interest on mortgage = 13.5%
Time required = 40 years
a) To get the required downpayment;
![\begin{gathered} \text{ Downpayment = 15\% of \$119,000} \\ \text{ Downpayment }=\text{ 0.15 }*119,000 \\ \text{ Downpayment =\$1}7,850 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/pu0qkmo6t03mcemal5q1lzkfq38p22h4zy.png)
Hence the required downpayment is $17,850
b) To get the amount of the mortgage on the property with the 15% down payment, we will take the difference in the cost and downpayment.
Amount of mortgage = Cost - Down payment
Amount of mortgage = $119,000 - $17,850
Amount of the mortgage = $101,150
c) To get the cost of 4-points on the mortgage, we need to first calculate the 13.5% interest on a 40-year mortgagee.
![\begin{gathered} \text{Interest}=\text{PRT} \\ \text{Interest}=119,000*0.135*40 \\ \text{Interest}=\$642,600 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/n6q4fzw5a73f123cd8ppj6rpgpofixa5cw.png)
Cost of 4 points on mortgage = $119,000 + $642,600
Cost of 4 points on mortgage = $761,600