Starting with $36.24..Calculate 10 % real quickly, can you do that? Thats about $3.60, just move the decimal over one.. not hard, is it? Now half that is $1.80. Still easy, right? Now add them.. $ 5.40 Easy, wasn’t it? Not exactly rocket science, is it?
LOL that's exactly how I do it. It never ceases to amaze me how many people can't do that.