The Amazing Computer
Riddle: A store has on sale a computer and word processor small enough to fit in your pocket. It can add, multiply, subtract, divide, and write in all languages. A delete device will correct any error. No electricity is required to operate it. The price? Only a few cents! How can the store make a profit by selling it so cheap?
Answer: The computer is a wooden pencil with an eraser!
Source: https://www.riddles.com/index.php/4468
