Apples 1EUR a kilogram = but 4 for 0,12EUR?

A funny thing happened to me at the supermarket yesterday. Apples were selling for 1 EUR a kilogram (= 2.2 lbs), and I put four of them into a bag and went to have them ticketed by the agent sitting at the counter, who weighs them, presses a button, and sticks the ticket on the bag.

I had four apples in there and the total came out to 0,12 EUR?
Those were the cheapest apples I've ever bought.