A old man was selling watermelons. His price reads 1 for $3 and 3 for $10.
A young man stops by and asked for one watermelon. That’d been $3 said the old man.
The young man then buys another one, and another one, paying $3 for each.
As the young man walked away he turned to old man, smiled and said “Hey old man, do you realized I had bought 3 watermelons for only $9? May be business is not your cup of tea.”
The old man too smiled and mumbled to himself, “People are too funny. Every time they buy three watermelons instead of one, still they are trying to teach me how to do business.”