A shop raises the price of a commodity by 25% in violation of the price policy. After the price department finds out, it orders it to restore the original price. How much should they lower the current price?
一个商店违反物价政策擅自把一种商品的价格提高了25%，物价部门发现后，责令其恢复原价，他们应该把现价降低多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) / (5/4)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>