The original price of a 3G mobile phone is 3,000 yuan, and now it is sold at a 15% discount. How much is it cheaper than the original price now?
一款3G手机原价3000元，现在八五折出售，现在比原来价格便宜多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">3_000 * (3/20)</gadget>
<output>450</output>

<result>450</result>