数学题：一件商品原定价120元，现在打7折出售，仍可获利5％的利润。原来定价时所期望的利润是多少元？

数学题解答：此题的关键之处是弄清5%的利润是占原定价的5%，还是打7折价格的5%，根据生活中的经验，此处的5%的利润应是指原定价的5%。

先算出打七折的价格：120　×　70%　＝　84（元）

再算出5%的利润是多少元：150　×　5%　＝　6（元）

算出进货价格：84　-　6　＝　78（元）

原来的利润是：120　-　78　＝　42（元）

答：原来定价时所期望的利润是42元。

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