Final answer:
To cover the mortgage insurance, the couple will need to add $212.50 to their monthly PITI payment.
Step-by-step explanation:
To calculate the amount added to their monthly PITI payment to cover the mortgage insurance, we need to find 5% of the home's purchase price first.
5% of $300,000 = $15,000.
Then, we need to calculate 0.85% of the mortgage amount to find the annual cost of the mortgage insurance.
0.85% of $300,000 = $2,550.
To find the monthly cost, we divide the annual cost by 12.
$2,550 / 12 = $212.50.
Therefore, the couple will need to add $212.50 to their monthly PITI payment to cover the mortgage insurance.