Yucai Primary School paid a total of 49.5 yuan for 10 badmintons and 25 table tennis balls, and Jiefang Road Primary School paid a total of 54 yuan for the same 20 badmintons and 20 table tennis balls. How much is 1 badminton cheaper than 1 table tennis ball?
育才小学买10只羽毛球和25只乒乓球共付49.5元，解放路小学买同样的20只羽毛球和20只乒乓球共付54元，1只羽毛球比1只乒乓球便宜多少元．
<gadget id="calculator">49.5 * 2</gadget>
<output>99</output>

<gadget id="calculator">99 - 54</gadget>
<output>45</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<gadget id="calculator">45 / 30</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">54 / 20</gadget>
<output>27/10 = around 2.7</output>

<gadget id="calculator">(27/10) - (3/2)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(3/2) - (6/5)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>