SECTION 1.  Section 89 of Chapter 71 of the Massachusetts General Laws, as appearing in the 2002 Official Edition is hereby amended by striking out the third and fourth sentences in subsection (i) and inserting in place thereof the following:

            (i) In any fiscal year, a public school district’s total charter school tuition payment to the commonwealth’s charter schools shall not exceed nine per cent of said district’s net school spending; provided, however, that a public school district’s total charter tuition payment to the commonwealth’s charter schools may equal twenty per cent of said district’s net school spending if the board determines the MCAS scores for a school district place said district in the lowest ten percent of all statewide MCAS test performance scores for two consecutive years.  The board shall not approve additional applications for any new charter schools in these designated school districts if the district’s MCAS scores rise above the bottom ten per cent of all statewide MCAS scores for any two consecutive years after said determination is made by the board.  The commonwealth shall incur charter school tuition payments for siblings attending commonwealth charter schools to the extent that their attendance would otherwise cause said school district’s charter tuition payments to exceed nine per cent of said school district’s net school spending.