Write the next sentence in the following story.

How to write an iou
Include the date and the amount being borrowed, or the amount agreed on for the service or product.
How much did you loan out?
Include a due date for return of the funds.
When do you expect the borrower to pay you back? If multiple payments will be made, agree on specific dates for the payments.
Include how much interest you will charge. Especially if you're lending money to a friend or family member, it may seem a little extortionate to charge interest.