20 yuan for every 4 bottles of drinks, buy 10 bottles and get 1 bottle free. We have 43 people, and each person drinks 1 bottle. How much will it cost at least?
每4瓶饮料20元，买10瓶送1瓶，我们有43人，每人喝1瓶，至少要花多少钱？
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

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

<result>200</result>