The normal selling price of a product is 15 yuan, and now it is being sold at a 20% discount for some reason. What is the current selling price?
一个商品的正常售价是15元，现因故打8折销售，现售价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 * (4/5)</gadget>
<output>12</output>

<result>12</result>