Again, we had already learned most of these tools, such as the sum function and the header, very well in class (thanks professor). Therefore, it was not too hard of an assignment. It took me a few tries to figure out what was wrong with my header, until I finally realized I wrote "displacement" instead of "replacement". We all make stupid mistakes sometimes. Otherwise, it was a good exercise. I love fact that you can drag that sum function over to consecutive columns. It's a tremendous tool to possess and makes things a lot quicker.