8. Say in one word.1. What do we call a person

8. Say in one word.
1. What do we call a person who sells goods (does shopping, to whom you pay money in a store)?
2. What do you call a place where you do shopping (pay for your goods, try on clothes, the goods are displayed)?
3. What do we call the department where ready-made clothes (shoes, face cream, milk, meat, bread, ) are sold?