Suppose you took out a 15-year mortgage for $160,000, at an annual rate of 7%. After 5 years, the 15-year mortgage rate dropped to 2%, and you decided to refinance at this low interest rate. (a) How much remains to be refinanced on the second mortgage? (b) How much will your new monthly payment be? (c) How much do you save (gain) by refinancing? (Write the answer upto 2 decimal places.) Click here to enter answer Suppose you have decided to retire as soon as you have saved $ 140,000. Your plan is to put $ 400 each month into an ordinary annuity that pays an annuity interest rate of 6%. If you are now 20 years old, how old will you be when you retire? years Done