Please help with the following:

The Youngs bought a $282,000 house. They made a down payment of $45,000 and took out a mortgage for the rest. Over the course of 30 years they made monthly payments of $1420.94 on their mortgage until it was paid off. (a) What was the total amount they ended up paying for the house (including X s Q the down payment and monthly payments)? ' $[l] (b) How much interest did they pay on the mortgage? $|]