Question 4:(20 points) (A) A company borrowed $ 18,000. The company plans to set up a sinking fund that will pay back the loan at the end of 7 years. Assuming a rate of 10% compounded semiannually, find the Sinking Fund of the ordinary annuity. (6 points) (B) An employee decided to invest $ 750 quarterly for 9 years in an ordinary annuity at 12%. What is the total cash value of the annuity at end of year 9? (7 points) (C) What must YOU invest today to receive an annuity of $ 1,250 for 10 years compounded at 16% quarterly when all withdrawals will be made at the end of each period? (7 points)