Finance Midterm

So I've got my finance final coming up, and to prepare I decided to go over my midterm as it is a cumulative test.  I'm going over one of the problems, for which I received half credit, 5 out of 10.  As I'm going over the answers she gave us, I'm thinking well, I must have been pretty close since I got half credit.  Also, she told us she would give us a few points as long as we draw the correct time line.  I decided to look at my midterm answer to see exactly what I did wrong.   I was not even close. Here you go:

11.
Part A.  Correct Answer = $11,700.
                     My answer= $92,450
               A difference of = $80,750

Part B.  Correct Answer= $142,000
                   My Answer= $8,467,000
              A difference of= $8,352,000

Oh and I had no time lines anywhere.  How the shit did I get half credit?