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21 January, 18:19

An item with an original price of d dollars has its price increased by x percent in April and then decreased by x percent in May. The resulting price is 4 percent less than the original price. What is the value of x?

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  1. 21 January, 19:17
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    So the final price would be:

    d (100+x) (100-x) / 100²

    = d (100² - x²) / 100²

    = d (1 - (x/100) ²)
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