I agree with what both @get_away06 and @Jennifer are saying, but I'll elaborate some more on what worked for me.
Like get_away said, it's machine graded. So first thing, make sure you don't have any spelling errors and no glaring grammatical errors. Also, I believe the computer is looking for what I call “buzz” words which are certain words that are connected to the topic of the question. So, in the intro paragraph repeat the question they asked but not verbatim and use some of the key phrases from the questioning. With the last sentence propose your solution using the “buzz” words. For example, if you get a question about the cash conversion cycle, a few “buzz” words would be accounts receivable, accounts payable, and inventory. Or, if you get a question about aggregate demand a few “buzz” words would be government spending, consumption, interest rate, exports, etc.
In the body paragraph(s) write a little explanation on each “buzz” word and tie it into the answer to the question. You don't have to write a novel, just get down the basics and move on. Remember, these are supposed to be memos, not essays. Maybe write down each “buzz” word when you initially think of it so you don't forget any of them as you are typing.
For the conclusion, repeat the question again in different words but maintaining some of the key phrases from the question. Then a quick sentence or two about what your solution was using as many “buzz” words as possible. Then wrap it up with a quick “if you have any more questions….yada yada yada.”
Boom. You're done and ready to move on to the next one.
.