Using a tree diagram to solve, A computer retailer sells laptops and desktop computers. It has stores at 2 locations. At its university campus store, 55% of its computers are laptops. At its downtown store, 35% of its computers are laptops. 25% of its sales are from the university campus store and 75% of its sales are from the downtown store. Given a computer purchased from this retailer is a laptop. Find the probability that it was purchased at the university campus store.

False