A shopping mall held a "Welcome to May Day" promotional activity. Buy five pairs of all socks and get one free. A pair of socks costs 7.68 yuan. Aunt Zhang bought 12 pairs. How much did she spend?
某商场举办"迎五一"促销活动，所有的袜子买五双送一双．一种袜子每双7.68元，张阿姨买了12双，花了多少钱？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

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

<gadget id="calculator">7.68 * 10</gadget>
<output>76.8</output>

<result>76.8</result>