"What amount is a frozen yogurt sundae?"
"50 pennies," answered the server.
The young man hauled his hand out of his pocket and considered various coins in it.
"35 pennies," she said abruptly.
The young man again numbered the coins. "I'll have the plain dessert," he said.
The server brought the dessert, put the bill on the table and left. The kid completed the frozen yogurt, paid the clerk and withdrew.
At the point when the server returned, she started wiping down the table and after that gulped hard at what she saw.
There, put conveniently alongside the vacant dish, were 15 pennies – her tip.