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    How do you work them out?
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    Well 'forwards' would be
    something used to cost £100 and then the price went up by 13%... what is the new price

    'backwards' is

    something now costs £66 after the original price was reduced by 70% in a sale... what was the original price

    so you're being asked to find 100% of the original price and you're told £66 is 30% of the original price - because subtracting 70% of the original price means 30% of the original price is left.

    so in that case you could divide £66 by 3 (to get 10% of the original price)
    and then multiply that by 10 to get 100% of the original price.
 
 
 
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Updated: October 13, 2017
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