Some time ago, when the ice-creams were not so expensive, a ten-year boy went to Nirula’s ice-cream shop. While sitting at the table, he asked the waiter "How much does a Sundae cost?"

"Rs. 40" he replied.

The boy took out his money from the pocket and began counting it. "Well how much does a simple ice-cream cost?" There were other people waiting to be served, so the waiter began to get a little impatient.

"Rs. 30" he said abruptly.

The boy counted his money again and said: "Please get me a simple ice-cream!" The waiter served him the ice-cream and the bill. The boy ate his ice-cream, paid his bill at the cash counter and left.

When the waiter went to clean the table he began to cry… for there in the corner of the plate, were Rs. 10, his tip. The boy took a simple ice-cream instead of a Sundae so he could leave a tip for him…