Worried that his son was spend…

Worried that his son was spending too much money on dates, a Father asked the boy how much his last date had cost.
Johnny calculated a minute then replied, “Oh, about €15 or so I think.”
“Well,” said the Father, “I’m proud of you for finally coming up with an inexpensive evening.”
“To be honest Dad,” Johnny went on, “we’d have done more, but that was all the money she had.”