How to solve this problem?
http://elearn.nccu.edu.tw/school/100...ontent/ps2.pdf
I only can solve (I)
How to answer (ii)and(iii)?

1) the coffee beans industry is relatively more labour intensive.

It would appear from the data as given that the coffee beans industry is
Twice as labour intensive than the diamonds industry.

Just for interest sake.
May I recommend a text book called INTERNATIONAL ECONOMICS
By Kindelberger.

I studied this text bask in the sixties when I was doing my Economics Degree.

Roland.