A medicine is now priced at 30 yuan, which is (2/7) lower than before. How much is this drug lower than the original?
一种药品，现在的售价是30元，比原来降低了(2/7)．这种药品比原来降低了多少元？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">30 / (5/7)</gadget>
<output>42</output>

<gadget id="calculator">42 - 30</gadget>
<output>12</output>

<result>12</result>