The price of a certain stock fell (1/4) and then rose (1/4). The current price is 15 yuan, what was the price before the price fell.
某股票价格下跌(1/4)以后又上涨了(1/4)．现价是15元，下跌之前的价格是多少元．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(3/4) * (5/4)</gadget>
<output>15/16 = around 0.9375</output>

<gadget id="calculator">15 / (15/16)</gadget>
<output>16</output>

<result>16</result>