Patti is just about to take out a 20-year house loan for $160,000 at an APR of 8.4%, compounded monthly. She asked the loan officer, "What will the remaining balance be on my loan after 10 years?' Help the loan officer respond to Patti's question. Part I: What will the periodic interest rate of Patti's house loan be? Part II: How many monthly payments will Patti have made once her house loan is paid off? Part III: What will Patti's monthly payment be? Part IV: How many monthly payments will Patti have made after 10 years?