Voters in six eastern Iowa counties approved school bond issues Tuesday. The one-cent local option sales tax was passed by overwhelming margins in Benton, Bremer, Butler, Grundy, Hardin and Tama counties. The widest margin of approval was in Hardin County, where 80-percent of the voters said “yes” to the measure. Seventy-five percent approved the issue in Grundy County, while 73-percent agreed to the measure in both Butler and Tama counties. In Bremer County, 71-percent favored the issue, while 68-percent said “yes” in Benton County. Money generated from the penny sales tax will raise millions of dollars for school improvements in each of the six counties. Voters in Webster City and the surrounding area went to the polls Tuesday. Hamilton County voters approved the school infrastructure local option sales tax by a margin of 1134 to 331. It takes effect July first and will be in effect for ten years. Some 70 Iowa counties have passed similar measures.