Whether it was normal for a part-time typing clerk to pay a 50 yuan express delivery fee depended on the specific situation. In some cases, part-time typing assistants may ask customers to pay 50 yuan or more for express delivery. This is because they send documents or content directly to the customer and the customer may need to use the express delivery service to transport the documents or content. This may be reasonable in certain circumstances, for example, if the customer needs to send documents or content from one place to another, or if the customer agrees to bear these costs. However, in some cases, this request might be unreasonable. For example, if the customer had agreed to pay the fee but found that the fee was too high or the customer could use other cheaper transportation methods to transport the documents or content, then this situation was unreasonable. Therefore, if you are considering working as a part-time typing clerk on the Internet, it is recommended to carefully understand the company's requirements and fees and check the comments and reviews of other customers to determine whether the company is a legal and trustworthy company.