Hey Salim, every bottle with the first sign is worth 25 cent, the other sign is worth 15 cent. normally every supermarket takes them back, there are some automatically take back stations. you put the bottle in it and when you finished, you press a button and will get a paper. with this paper you have to go to the cashier of the supermarket and he or she will give you the money.
Hey Caro, sorry for the mistake - i didn't get it right.