I want to know information on two things.
i. Is there a tutorial sort of thing on the internet to learn excel
programming from scratch. I would like to see a user guide on how to as well
as some sample exercises to work on.

ii. I have a file that comes in a format as below :

Date Product Name Price Category
1/1/04 A1 100.00 High End
2/1/04 A1 105.00 High End
3/1/04 A1 135.00 High End
4/1/04 A1 175.00 High End
5/1/04 A1 205.00 High End
6/1/04 A1 215.00 High End
1/1/04 B1 100.00 High End
2/1/04 B1 105.00 High End
3/1/04 B1 135.00 High End

There are other products and other categories. I would like to get something
of the following format :
Date Product Name Price Category
Percentage change
1/1/04 A1 100.00 High End
Not applicable
2/1/04 A1 105.00 High End
=(New minus Old prices ) / price


Can someone help with the percentage changes ? Thanks
Srikanth Vee