After the price of a DVD player is reduced by 15%, the selling price is 170 yuan. How much is the original price?
一台影碟机降价15%后，售价是170元，原价是多少元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">170 / (17/20)</gadget>
<output>200</output>

<result>200</result>