If federal money is made available to the state without limitation or restriction as to the educational purposes for which it may be spent or if the federal money is made available to the state for alternative educational purposes, including payment of teachers' salaries, the governor or the board as the federal law may require may use a percentage of the money, not to exceed 50 percent, for increasing teachers' salaries in conformity with a minimum state salary schedule to be adopted by the board. The governor or the board as the federal law may require may use the remainder of the money to supplement existing educational programs.