pens are 10 yuan, "buy ten get one free" (buy ten get one free). If every student in our class needs one branch, how much should we pay at least?
2枝钢笔10元钱，"买十送一"(买十枝送一枝)．如果我们班每个同学都需要一枝，至少要付多少钱？
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">44 / 11</gadget>
<output>4</output>

<gadget id="calculator">44 - 4</gadget>
<output>40</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<result>200</result>