A customer brought four items to the cashier of a convenience store. The clerk rang up the items and said, “Okay, I multiplied the prices together and your total cost is $7.11.”
“You multiplied them?” the customer asked. “You’re supposed to add them, you know.”
“I know,” said the clerk, “but it doesn’t make any difference. The total is still $7.11.”
What were the prices of the four items?