The Anderson Community Schools Board was given startling, but unsurprising budget numbers Tuesday night.  Business Manager Kevin Brown says the school district faces an $8.8 million budget shortfall by the year 2011.  And by 2013, that shortfall could rise to more than $20 million.  Brown says those are worst-case scenario numbers.  In the best situation, A-C-S will have a 2011 budget shortfall of $800,000.  For that to happen, voters will have to pass a tax referendum in November that adds 52 cents to the district’s tax rate.  Brown also says he expects the district to lose 600 students next year.