10p or 20p?

[simondjuk]

"Okay, that'll be 20p," said the cashier as he scanned my Freddo.

"What!?" I shouted. "But it says 10p on the wrapper?"

"Yes, I know it says that on it, but it is actually 20."

"Fine," I said, as I begrudgingly handed him the cash.

"Ummm, excuse me sir," the man slid the coin back across the counter. "You've handed me a ten pence piece."

"Yes, I know it says 10p on it but it is actually 20."