Open Question: how many of my baby rats will have big ears?

fancy rat accidentaly bred with my dumbo. i know that the big ear gene is recessive, but how many of them will have the droopy and big ears? (there are 10 babies) thanks :) oh yea dont tell me "oh u shouldnt of bred the rats.. millions of rats everywhere... dumbo gene is a mutation" because i bought her like that .... it wasnt my fault!!!