Try really hard not to look at the answers before you come up with your own, as tempting as it is.
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My sister trolled me with this series of questions a few years ago.
I actually sat down and worked this out and found the answer. but the link for the pin doesn't have the answer so then i had to google it to find the answer. I don't know about the 2% part but i still feel foolishly pleased with myself...
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TriBond - three words with a common bond. Easy, medium, and hard TriBonds with answers