The color TV promotion in the shopping mall is 10% off. The current price of a color TV is 3150 yuan, which is much cheaper than the original one.
商场彩电大促销，全场九折，一款彩电现价3150元，比原来便宜了多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3_150 / (9/10)</gadget>
<output>3_500</output>

<gadget id="calculator">3_500 - 3_150</gadget>
<output>350</output>

<result>350</result>