A homeowner took out a 20-year fixed-rate mortgage of $175,000. The mortgage was taken out 6 years ago at a rate of 6.75 percent. If the homeowner refinances, the charges will be $3,050. What is the highest interest rate at which it would be beneficial to refinance the mortgage? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Answer is complete but not entirely correct. A homeowner took out a 20-year fixed-rate mortgage of $175,000. The mortgage was taken out 6 years ago at a rate of 6.75 percent. If the homeowner refinances, the charges will be $3,050. What is the highest interest rate at which it would be beneficial to refinance the mortgage? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Answer is complete but not entirely correct