Dear Sir or Madam,

Dear Sir or Madam,
I am a junior school student in Peking University who comes from a disadvantage family.Having conceived an idea for a long time,I write this letter apply for the student loan so as to reduce my family’s financial burden.
I appreciate the opportunity of having studied in Peking University with my classmates.So I study very hard and get high marks in every course.But my family cannot afford to my tuition now.If you are so kind as to accept my application,I will be very grated.
Please let me know your decisionat at your earliest convenience.I really hope you can accept my application.
Yours faithfully,
Lucy
最后一句话打错了，多了一个at 应该是这样
Please let me know your decision at your earliest convenience.I really hope you can accept my application.