In the "Eleventh Promotion" activity, the price of the washing machine is reduced by 5%, so the current price is the original price.
在"十一促销"活动中，洗衣机降价5%，那么现价是原价的多少．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">(19/20) / 1</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>