The original price of a commodity is 52 yuan, and the current price is 39 yuan. How much has the price been reduced?
一种商品原价是52元，现价是39元，降价了多少．
<gadget id="calculator">52 - 39</gadget>
<output>13</output>

<gadget id="calculator">13 / 52</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>