E.g. "after a discount of whatever% the price of the article is whatever - find the original price". The challenge there isn't the manipulation of the fractions, it's the understanding of the world to get to the sum. DS found that hard for a little while, mostly I think because of lack of shopping experience!
This completely reminded me of my mother! She is incredibly math-phobic, outsourced our homework questions to my dad when we were kids - but wow, in a department store, she was the queen of the 40% percent off. She could calculate percent off, tax, whether it was worth the sale or use the coupon. It was astounding!
DeHe
