please answer 3 and 4

Question 3 (1 point) How long will it take to pay off a debt of $47,000 if you make payments of $400 at the end of each month? Assume that the debt charges interest at a semi-annual rate of ja=7.20%? Express your answer in years rounded to 2 decimal places. Your Answer: Answer Question 4 (1 point) Calculate the amount that must be invested at the end of each quarter at j4=6% in order to accumulate $500,000 after 25 years. Your