In the supermarket, 2 pens cost 10 yuan, "buy ten get one free" (buy ten get one free) promotion. If you buy one for all 44 students in the class, how much will you pay at least?
超市里，2支钢笔10元钱，"买十送一"(买十支送一支)促销．如果给全班44个同学都买1支，至少要付多少元？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<result>200</result>