I am looking for an opportunity to showcase my skills. I am a student therefore willing do your work at minimal cost as I need to make my resume strong. I will share the source code with you, so that future additions and improvements would not be an issue.
You have a vague description, still I assume I will be able to do this in 7 days.
You might think that 7 days is a long time, but I don't want to trouble you with poor quality, hastily done application. Good things take time. Still I'll try to do the task within the time frame.
Looking forward for your response. I have built applications of importance in my summer internship, trust me, I'm no novice.