Phil graduates in 3.5 years and wants to buy a new car then. How much should he save now to have $3,600 for the down payment for the car by the time he graduates if he can invest it at 6% compounded monthly? Type your final answer in the blank. Sarah invests $5,400 in a retirement fund that pays 4.2% interest. Compare the value of the fund after 25 years if (a) the interest is simple interest. (b) the interest is compounded quarterly. (c) Which one is the more profitable option for Sarah