A bicycle is sold at a 10% discount, and the current price is 270 yuan, how much is it reduced.
一辆自行车打九折出售，现在售价270元，降低了多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">270 / (9/10)</gadget>
<output>300</output>

<gadget id="calculator">300 - 270</gadget>
<output>30</output>

<result>30</result>