kind of ballpoint pen, the original price is 2.5 yuan each, and now it is sold at a (1/5) reduction, how much is each now?
一种圆珠笔，原价每支2.5元，现在降了(1/5)出售，现在每支多少元？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2.5 * (1/5)</gadget>
<output>0.5</output>

<gadget id="calculator">2.5 - 0.5</gadget>
<output>2</output>

<result>2</result>