Tong Yao only bought a hundred bubble tea cups, hardly enough to keep up with the demand. Seeing the students queuing up, each with a water bottle in hand, an idea struck her. She shouted to the students, "Bubble tea will be one cent cheaper if you fill it in your own cups!"
Hearing they could save by not requiring a cup, many students were tempted. A shy fifteen or sixteen-year-old girl peeked out from the crowd to ask,
"What if I haven't finished drinking the water in my cup?"
"You can come back during break time or after school. I'll be here all day," Tong Yao answered.
After some thought, the young girl said, "I guess I'll come back during the break." After all, buying now would mean standing in line. It seemed more sensible to return during a break.
