Sunshine Supermarket bought a batch of pens at a price of 2.6 yuan each, and sold them at a price of 3.2 yuan (7/8), not only recovering the cost, but also making a profit of 80 yuan. How many pens did this batch come in?
阳光超市以每支2.6元的价格购进一批钢笔，再以3.2元的价格卖出(7/8)后，不但收回成本，还能盈利80元．这批钢笔共进了多少支？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">3.2 * (7/8)</gadget>
<output>2.8</output>

<gadget id="calculator">2.8 - 2.6</gadget>
<output>0.2</output>

<gadget id="calculator">80 / 0.2</gadget>
<output>400</output>

<result>400</result>