4-31. A 22-year-old college graduate just got a job in Nashville. She is considering buying a house with a $200,000 mortgage. The APR is 4% compounded monthly for her monthly mortgage payments on a 30-year fixed rate loan. If she can get her FICO score up to 750, the APR drops to 3.6%. How much in interest cost will she save over the life of the loan assuming she can increase her FICO score to 750? (4.7)