I'm thinking of taking a class to practice English. It is not for free and the cost is in my interest. As I'm just a student, I don't enough money to take a class that demands me high cost. So, I'm going to call the academy and ask like this:
I'd like to ask how much it is that I take the class.
I'd like to ask how much the class is.
I'd like to ask how much money the class takes me.