I have two different problems and they are almost the same. I have to figure out after four years how much money would be in an investment fund. One goes from January 2007 and wants us to figure it out for January 2011. However, the other one says January 2007, but it wants us to figure that out for December 2011. I guess I just need to know which number of periods and which compound interest equation I am supposed to use to figure each one out. Can anyone help me?