Suppose Rachel and Nadia buy a house and have to take out a loan for $194000. If they qualify for an APR of 3.5% and choose a 30 year mortgage, we can find their monthly payment by using the PMT formula, If Rachel and Nadia decide to pay $1300 per month, we can use goal seek to see how many years it will take to pay off the loan. Use the PMT function and goal seek (as needed) to answer the following questions about Rachel and Nadia's mortgage. a. What is their monthly payment on the 30 year loan? b. If they qualify for the same APR on a 15 year loan, what will the new monthly payment be? c. If Rachel and Nadia have monthly payments of $1300 each month, how long will it take for them to pay off their loan? years d. If they want to have monthly payments of $750 and still pay the loan off in 30 years, what interest rate would they have to qualify for?