The price of a stock is 70% of the original price. How much has the price of this stock fallen from the original value?
一支股票的价格是原来的70%，这支股票的价格比原来下跌了多少．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / 1</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>