Tom Falkland is considering refinancing his home mortgage to reduce his house payment by $150 per month. Closing costs associated with the refinancing will total $6,500. Tom will finish medical school in 4 years, at which time he will sell the house and move to another state. (a) What is the payback period for refinancing this loan? (Round answer to O decimal places. e.g. 125.) Payback period months (b) Given Tom's plans, should he refinance his mortgage at this time?