Compute the stated principal and constant monthly payments due on a $30-$year mortgage that has a stated coupon rate of $6\mathrm{.}18\%$ and that has $1\mathrm{.}5$ points but enables you to borrow $$378,000+$U dollars in cash $($net of the points$)$ in order to buy a house $($which you have contracted to purchase for $$498,000+$U dollars using a $$120,000$ down payment$).($U$=10)$