Question when ordering taco bell.
Hello guys. I am a English learner. Yesterday I went to Taco Bell to order my lunch. I ordered a crunchwrap and then said I'd like to change "beef" to "steak", then the clerk asked me a question but I totally could not catch what her said, she repeated twice but I still don't understand, then she said "you want 1 dollar or what else" or something like that, I answered 1 dollar. Then we done. Eventually I found they charged me $1.2 to change my "beef" to "steak" in crunchwrap. My question is, what probably did she ask? and usually, what the clerk will say when I am trying to custom your food? Thanks.