Gahanna City Council has approved putting a one percent income tax increase on the November ballot. A similar proposal was defeated by voters in May, but city leaders say 12 percent of registered voters showed up at the polls. It would be the city's first income tax hike in 37 years. The revenue would be used to plug nearly 21 million dollars in budget gaps over the next two years. Leaders say if the measure is rejected, they would have to cut nearly 100 jobs and shut down a senior center and swimming pools.