Question 66404
the first information about the amount of the house is un-needed to answer the question. all you need is the amount cost per month.

because the 20 year period has 240 months. it would cost
240x$752.40=$180 576
and the 30 year period has 360 months it would cost
360x$660.60=$237 816

so the home owner would save $57 240 taking out the 20 year mortgage.