A Grain of Rice

When a humble farmer named Pong Lo asks for the hand of the Emperor's beautiful daughter, the Emperor is enraged. Who ever heard of a peasant marrying a princess? But Pong Lo is wiser than the Emperor knows. And when he concocts a potion that saves the Princess's life, the Emperor gladly offers him any reward he chooses--except the Princess.
   Pong Lo makes a surprising request. He asks for a single grain of rice, doubled every day for one hundred days. The baffled Emperor obliges--only to discover that if you're as clever as Pong Lo, you can turn a single grain of rice into all the wealth and happiness in the world!