Where's the error in my gas mixture composition calculation?

[MMCS]

Attached is the question and my working, my answers don't match up to the given answers, but they still seem right. Can anybody see where the mistake is?

 

[Sunil Simha]

Your calculations look alright to me but an expert's view on the matter will be definitely welcome. Have you asked your professor?

 

[Borek]

I don't see anything wrong about your numbers.

 

[MMCS]

Ok thanks. The answers provided are the ones given by the professor, ill assume he has made an error.