Please help me question 3 and question 4, explain step by step how you do it

Saved Question 3 (0.5 points) Your company wishes to borrow 40 k$ (in thousands of dollars) to pay for infrastructure improvements using bonds that pay out quarterly at an annual interest of 15% over 15-years total to pay off the bond (loan). What is the cumulative interest paid rounded to the nearest dollars ($)? Ci= $. Your Answer: 61104 Answer Question 4 (0.5 points) You make quarterly deposits to a retirement investment account over 15-years of 12 k$ (in thousands of dollars) each quarter. The assumed annual rate of return (interest) is 9% compounded quarterly. What is the projected total amount (k$) in your retirement account at the end of 15-years rounded to the nearest thousand dollars (k$)? F k$