How many college graduates does it take to figure out how to work a calculator?

Far too many, I found out. I have a series of numbers I needed to figure out percentages for. Now, I know how to do this by hand, but there are a lot of them and I wanted to take the easy way out and use a calculator. As with many things in life, the short-cut ended up costing me more angst than it was saving. I've been trolling the hallways, trying to find someone who knows how to work the percentage button on their calculator. I'm still searching. In the meantime, it's back to the old skool methods for me.