If a commodity is sold at a 30% discount, it will be 270 yuan cheaper than the original price. If it is sold at a 50% discount, how much is it cheaper than the original price?
一种商品，如果打七折出售，要比原价便宜270元．如果按五五折出售，要比原价便宜多少元？
<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">270 / (3/10)</gadget>
<output>900</output>

<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">900 * (9/20)</gadget>
<output>405</output>

<result>405</result>