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Barbra has a coupon for 5% off of the cost of her dinner, She tips the waiter 20% of the discounted priice of her dinner, and pays a total (discounted dinner price + tip) of $18.24, how much did her dinner cost before the discount?

  • math -

    Let x = regular cost of dinner.

    x - .05x + .20(x-.05x) = $18.24

    Solve for x.

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