product is sold at a 40% discount, and the selling price is 240 yuan. What is the original price?
某商品降价40%出售，售价是240元，原价是多少元．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">240 / (3/5)</gadget>
<output>400</output>

<result>400</result>