Math Inquiry-Birthday Money and...

Yesterday, we worked on a math inquiry involving birthday money.  We had a really hard time figuring out this problem.  Most groups thought you just had to add $2 each year but the key word was double.  Take a look at some group work that was close (sorry they are upside down...did not edit my photos!).

Look what I found on my computer this afternoon...they are back!  Any ideas for names?