Okay, maybe because of the time I had I couldn't create a comprehensible tutorial of what you should do. These days I am working on a video tutorial since I didn't manage to do it inside the game itself.
The idea is that you are in charge of the shopping area and you have to make sure customers take the offer. In your case, in the laundry, there would be a discount, so if there are a lot of people in the laundry, you should slow them down using constructions so that everyone arrives without getting angry; otherwise, there will be crowded spots. In the case of Asian food, in that mission, you have to make sure that 70% of the buyers do not manage to buy and leave satisfied with their discount.