commodity is sold at a 15% discount, and the current price is 425 yuan. How much is it cheaper now than before?
某商品以八五折出售，现价425元，现在比原来便宜了多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">425 / (17/20)</gadget>
<output>500</output>

<gadget id="calculator">500 - 425</gadget>
<output>75</output>

<result>75</result>