It costs 23.4 yuan to buy 2 notebooks and 1 pen, so how much will it cost to buy the same 12 notebooks and 6 pens.
买2本笔记本和1支钢笔共用去23.4元，那么如果买同样的12本笔记本和6支钢笔要用去多少元．
<gadget id="calculator">23.4 * 6</gadget>
<output>140.4</output>

<result>140.4</result>