Li Qiang wants to buy 2 pens, but the difference is 0.6 yuan. If he buys 1 pen, he has a surplus of 0.8 yuan. How much does this pen cost?
李强想买2支钢笔但差0.6元，买1支又余0.8元，这种钢笔卖多少元一支？
<gadget id="calculator">0.6 + 0.8</gadget>
<output>1.4</output>

<result>1.4</result>