How to answerthe 'how much do you want to earn' question?

I want to get a job during the summer, I am young and not that experienced. The job asks for basic knowledge of HTML and CSS and a will to improve. They ask how much do you want to earn after 3 and after 6 months of working there. I 'm 18, still live with my parents so I don't really need much money, but I still want to make some. I don't know how to answer the question since the job is entry level for me to lean and get some experience.

Thanks.

edit: average pay in my country is around $300-400 a month for all jobs