The document provides guidance on how to structure a formal persuasive letter. It explains that each paragraph should address a different point: the problem, why it's bothering you, and a proposed solution. It then provides an example letter written by a customer to a shop owner. The first paragraph identifies the problem as poor quality produce purchased from the shop. The second paragraph explains why this is bothering the customer and that it is unacceptable. The third paragraph suggests investing in a new refrigerator and checking current stock as a solution.