On weekends, Mom and Dad took Xiaoqiang and his sister to the zoo to play. Ticket price: 16.8 yuan for each adult ticket, half price for children's tickets. How much does Xiaoqiang's family pay for tickets?
周末，爸爸妈妈带着小强和妹妹去动物园游玩．门票票价：成人票每张16.8元，儿童票半价．小强一家买门票应付多少元？
<gadget id="calculator">16.8 / 2</gadget>
<output>8.4</output>

<gadget id="calculator">8.4 * 2</gadget>
<output>16.8</output>

<gadget id="calculator">16.8 * 2</gadget>
<output>33.6</output>

<gadget id="calculator">16.8 + 33.6</gadget>
<output>50.4</output>

<result>50.4</result>