When you write a letter asking anyone to loan you money, first start out by explaining how you will pay it back and when.
Sample:
Dear Boss,
I am earning SR300 a week, and I can spare SR30 a week to pay back a loan of SR30000. I expect to be able to pay it all back by (whatever date). Can you please loan me that amount?
Sample:
Dear Boss,
I am earning SR300 a week, and I can spare SR30 a week to pay back a loan of SR30000. I expect to be able to pay it all back by (whatever date). Can you please loan me that amount?