Originally Posted by TheGeek
OK, in all seriousness, our CPA at my office can literally do this in his head in second. I mess with him all the time "Hey bob, what's 20% off 1448.74" -- BAM answer. Of course I don't need it.
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Oh sure. You take 10% and then multiply it by 2.
10% of 1448.74 is (rounded) 145, times 2 is 290.
/edit: shh! don't tell him I told you his secret!