Help me solve D, please.

Steven Garcia is saving for his son's college tuition. His son is currently 11 years old and will begin college in seven years. Steven has an index fund investment worth $7,790 that is earning 9.5 percent annually. Total expenses at the University of Maryland, where his son says he plans to go, currently total $15,500 per year, but are expected to grow at roughly 6 percent each year. Steven plans to invest in a mutual fund that will earn 11 percent annually to make up the difference between the college expenses and his current savings. In total, Steven will make seven equal investments with the first starting today and the last being made a year before his son begins college. (a) Your answer is correct. What will be the present value of the four years of college expenses at the time that Steven's son starts college? Assume a discount rate of 5.5 percent. Assume that the tuition payments are made at the end of each year. (Round answer to 2 decimal places, eg. 15.25. Do not round factor values.) Present value of tuition costs $ 88995.18 (b) Your answer is correct. What will be the value of the index mutual fund when his son just starts college? (Round answer to 2 decimal places, eg. 15.25. Do not round factor values.) Future value of investment 14704.03 Attempts: 1 of 2 used (c) Your answer is correct. What is the amount that Steven will have to have saved when his son turns 18 if Steven plans to cover all of his son's college expenses? (Round answer to 2 decimal places, eg. 15.25. Do not round factor values.) Target saving $ 74291.15 Attempts: 1 of 2 used d ) (d) * Your answer is incorrect. How much will Steven have to invest every year in order to have enough funds to cover all his son's expenses? (Round factor values to 4 decimal places, eg. 1.5212 and final answer to 2 decimal places, eg. 15.25. Do not round factor values.) Annual savings 7247.74 Save for Later Attempts: 1 of 2 used Submit