Hello,
I am a newbie with Ruby and I had a couple of questions while
manipulating csv files.  How would I do a multiple column sort?  I have
a file that needs to be sorted by the 3rd column, then 1st, then second.
I understand how to do one sort for the csv file but I was unsure of how
to do multiple.

 Also,How would I to do a percentage change between two numbers in a
column?

 Thank you very much.  I know these are easy questions but I am still
learning how to program in Ruby.

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