Tworandomly chosencustomers are buying laundry soap at the store. 40% of the laundry soap on the shelves is Tide brand. What is the chance that both of them purchase Tide laundry soap?

Tworandomly chosencustomers are buying laundry soap at the store. 40% of the laundry soap on the shelves is Tide brand. What is the chance that only one of them purchases Tide laundry soap?