A ballpoint pen costs 2 yuan, and a fountain pen is 4 times the price of a ballpoint pen. How much does it cost to buy 2 ballpoint pens and 1 fountain pen?
一支圆珠笔2元钱，一支钢笔是一支圆珠笔价钱的4倍，买2支圆珠笔1支钢笔，共要多少钱？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<result>12</result>