6. A woman makes 36 monthly payments into a fund earning interest at i(12) = 12%. The first payment is $100 and each succeeding payment is $10 greater than the preceding payment until $300 is reached. The next payment after that is $15 lower (i.e. $285) and each succeeding payment is $15 lower. What is the accumulated value of the fund immediately after the 36th payment is made? Put your answer in terms of the symbols (Is) (Ds), and s and then solve for the numerical value. (6 marks)