This question is asked to asses whether you can be available whenever the work demands more working hours from you. Try explaining him about the schedule and then say if they need more working hours I can make it by devoting time on essential work or allotting time for essential work.
Before answering this question ask your mom and dad about the minimum wage structure. If you have prior experience then make sure that you demand more because your experience counts. Seek help and advice from grown ups and friends they might help you. Generally to land in the job you can go for a minimum wage.
Try selecting those jobs from which you can learn. Challenging jobs help you in learning sphere as they will make you comfortable with the real challenges of the job and the prospect of learning them at an early stage of your life.
Make sure that you consult your mom and dad about the benefits a particular job will fetch you in future. Tell the interviewer what your mom and dad told you about the benefits you would likely be getting from that job.
When answering this question we pre assume that you have done enough research about the job demands and you have thoroughly read about the requirements of it if not you need to do it now. This is very important because they would like to know why you applied for it and is there any specific reason behind it.
Many companies pay you minimum wage but if you feel you are worth more than that may be because of your experience or working skills then it is better to ask that price. Chances and prospects of winning a job depend upon the quality work you produce.
There are some times when you are interviewed at the spot when you finished filling your job application. Be prepared in advance because you may never know when the interview can be scheduled because these interview positions are open whenever there is a vacancy and they need to fill it up ASAP.