SHIRLEY -- The proposed Ayer Shirley Regional School District assessment selectmen and the Finance Committee have been grappling with is $452,000 above last year's bill. The total assessment, if the School Committee budget stands, would be $900,000, which is $200,000 more than Town Administrator Patrice Garvin said she budgeted and which both boards say the town can't afford to pay. -- M.E. Jones