The Northville School Board has proposed this budget for the upcoming school year: 20% for school staff’s salaries 50% for school maintenance and upkeep 10% to refurbish the gymnasium 5% to upgrade the computer lab hardware 10% for new instruments for the music department 5% for new sports equipment After a brief discussion, the school board revised the budget as follows: 20% for school staff’s salaries 50% for school maintenance and upkeep 10% to refurbish the gymnasium 10% to upgrade the computer lab hardware 5% for new instruments for the music department 5% for new sports equipment In this case, the opportunity cost for was .