Dear Employer,
Thank you so much for giving me the opportunity to consider your work.
First, please do not confuse with my very low offer. It is because I recently try to get job in this website and should offer low costs to become popular, however I have 7 years of professional software engineering experience (4 years with Java and 3 years with C++ and Qt Library) plus 4 years of Bachelor degree. If you admit to work with me, then we can progress for an iterative development. That is to say, I immediately develope a beta version and share with you, and we can finalize it with close interaction. In addition, I have no other employment in these couple days, so we can finish all the work even in a few days.
Finally, if you decide to work with me, you will eventually realize that you finish your work with both the cheapest and one of the best employees.
Please do not hessitate to ask further questions.