This is my first attempt at using Course Hero and so far I am LESS THAN IMPRESSED! I uploaded everything that has to do with the problem let alone the fact that the question has already been asked and answered in your database. I just don't understand 2% of it. Why is it so difficult to get an answer from an already answered question?!? let alone when I upload EVERYTHING pertaining to the question!!! The first image is the from the book, the second image is the remaining part of the book that asks the questions and the third image is my work in the format that they asked for (which matches what was on course hero). All I need to know is how they got the $2,400 and $200 amounts in section B on the last image. Everything else I understand!

I just looked at the Kate's Cards SP7 homework review on here and I understand it all except section B. I understand most of section B but I don't understand the first amount ($2,400) and the last amount ($200 where they don't say where it came from either)? Any help here?