Hi
The cost is, I believe, taken from page 11 of the "The Economic and Social Cost of Illiteracy" April 2012 report from the World Literacy Foundation. The link is http://www.worldliteracyfoundation.org/The_Economic_&_Social_Cost_of_Illiteracy.pdf.
There's some other stuff that may be interest you at my website, Public Libraries News, at http://www.publiclibrariesnews.com/reasons-for/reasons-for-libraries-values-for-money.
I hope this helps.
Regards
Ian Anstice
www.publiclibrariesnews.com
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