The shopping mall held a June 1st promotion, buy 5 pairs of all socks and get 2 pairs free. A pair of socks cost 4.28 yuan, and Xiaohong’s mother bought 14 pairs. How much did she spend?
商场举办迎六一促销活动，所有袜子买5双送2双．一种袜子每双4.28元，小红妈妈买了14双，花了多少钱？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">14 / 7</gadget>
<output>2</output>

<gadget id="calculator">4.28 * 5 * 2</gadget>
<output>42.8</output>

<result>42.8</result>