“Oh no, not again!”
“What’s the problem, Mrs. Clabber?” Caleb asked.
“The register is 55 cents short!” Mrs. Clabber exclaimed, shaking her head.
“Can I take a look?” Caleb said. He noticed that the shiny register had the words AUTOCHANGE 2020 marked on the side.
“This register is new. It dispenses change automatically,” said Mrs. Clabber. “I always have the right amount of change in the drawer at the start of lunch. But by the end, exactly 55 cents are missing!”
“Don’t worry, Mrs. Clabber,” assured Caleb. “I’m on the case!”
The next day, Caleb dashed to lunch. He stood next to the fruit shelf, peering at the register.
Caleb watched the students pay for their lunches. Their change clinked automatically into the register tray. The prices of each item and the change given back added up correctly.
It was five minutes before the bell was about to ring, and everything seemed fine.