Fin 623 mid paper

I had done TAX paper today
pattern same 32 questions wala tha.

Q. what is PermanentEstablishment ? 3 marks
Q. computation of income which is partially agricultural and partly business.3 maks
Q. Tax treatment of Non resident income according to Pakistan source income ? why it is like this ? 5 marks
Q. computation of total income of non resident person according to 2009.
(is swal k liye ch 19 aur 20 ki nexamples solve kr lein)