A kind of TV, the price of TV is 450 yuan now, which is 10% cheaper than before. How much is it cheaper than before?
一种电视，电视现在售价450元，比原来便宜10%，比原来便宜多少元？
<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">450 / (9/10)</gadget>
<output>500</output>

<gadget id="calculator">500 - 450</gadget>
<output>50</output>

<result>50</result>