The road construction team spent 357 million yuan to build a highway, which was 15% less than planned, and how many billion yuan was saved.
修路队修筑一条高速公路，共用了3.57亿元，比计划节省了15%，节省了多少亿元．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">3.57 / (17/20)</gadget>
<output>4.2</output>

<gadget id="calculator">4.2 * (3/20)</gadget>
<output>0.63</output>

<result>0.63</result>