The price of a commodity after a 15% reduction is 170 yuan. What is the original price of this commodity.
一种商品降价15%后价格是170元．这种商品原价是多少元．
<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>