A toy is now priced at 18 yuan, which is 10% lower than the original price. How much is the reduction?
一种玩具现在售价18元，比原来降低了10%，降低了多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">18 / (9/10)</gadget>
<output>20</output>

<gadget id="calculator">20 - 18</gadget>
<output>2</output>

<result>2</result>