Difficulty understanding question wording

Hi all,

New to these forums but I had an Excel exam today and didn't understand what to do any Help would be appreciated ready for next exam

""It is anticipated that the cost price of games will increase by £1 per unit for the next year. We are considering making a set percentage addition to the cost price of all books. The set percentage would be the average of the percentages added to the cost price across the 3 price brands..."

The percentages given were for 2011 figures but I had to do 2012 figures...With the £1 increase?
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