Final answer:
When asking a question to a guest after taking their payment, you should inquire if they would like any condiments, napkins, or a copy of their receipt. These questions demonstrate good customer service by addressing the potential needs of the guest.
Step-by-step explanation:
After taking their payment, it would be appropriate to ask the guest if they would like any additional items or services that are commonly provided at the point of sale. For example, in a restaurant or fast-food setting, you might ask, "Would you like any ketchup or fry sauce?" This question caters to the customers' needs for condiments which they may appreciate. Alternatively, asking about napkins by saying, "Do you need any napkins?" is also pertinent as it relates to the practical necessity with their meal. Lastly, offering a copy of their receipt by inquiring, "Did you need a copy of your receipt?" is an important practice in providing proof of purchase and for the customer's financial records. All of these options show attentiveness to customer satisfaction and service quality.