So I'm playing around with SAT questions and I stumble upon this.

After about an hour of trying I can't seem to get it right:

Question: http://s3.postimage.org/wel17i1cj/bugproblem.png

So I read the explanation which infuriated me (or perhaps made me feel very stupid, we'll see).

Am I right when I say that they are asking you to solve for $\displaystyle s(10)$? They then go on to say that $\displaystyle s=100$ which is all fine and dandy but then the function would read: $\displaystyle 100(10)=$ right? Which makes no sense.

It's like saying: ''$\displaystyle f(x)=3x$, where f is the number of units sold and x is the price'', which makes no sense what so ever since $\displaystyle f$ denotes a function (same as $\displaystyle s$ in their example).

I'm really confused and a little sleep deprived so bear with me...