How much will the monthly payment be if Scott and Jen decide on a $30$ year mortgage on the $$155,000$ house with a $20\%$ down payment at $6\%$ interest? Down Payment Loan Amount Monthly Payment $10.$ How much do Scott and Jen save in total interest by taking out a $15-$year mortgage versus a $30-$year mortgage if they borrow $$124,000$ at $6\%$ interest? $($Remember to calculate manually.$)$