This is the problem.
I tried to find the FW first. I see the problem as "I deposite an initial money PW, and on the 4th, 5th, 6th and 7th I deposited $100". How much do I get at the end of the eighth year with i = 0.12.
That's how I interpret it.
I started by finding PW
which gives me 63.55 + 45.56 + 50.66 + 45.23 = 205. The outflow on is 40.39.
Either using 205 or 205-40.39, and then multiple that by (1 + 0.12) ^ -8 to get the PW, I either get 82.79 or 66.4832.
I kinda have the answer. I think the PW is 175.8 and FW is 935.28.
How do I get PW? What's wrong with my calculation?