How good is your maths? Mine isn't too bad.
While shopping recently I was much quicker than the assistant while calculating 15% off £16.00. 10% =£1.60, 5% = 80p, add both together = £2.40.
I've always calculated percentages with 10% as the starting point. If I needed to work out 71/2% I'd work out 5% then halve that then add the two together.
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Perhaps it's because I have just woken up and the brain hasn't engaged yet 
