40% of the extra cost government mandates are often unfunded 40 percent of its cost usually not enough 40 percent of its cost 40 percent of its cost 40% of the extra cost 40 percent of its cost Part B of the Individuals with Disabilities Education Act Part B of the Individuals with Disabilities Education Act Part B of the Individuals with Disabilities Education Act 40 percent of its cost 40 percent of its cost 40% of the extra cost 40 percent of its cost Part B of the Individuals with Disabilities Education Act