Xiaoqiang went to the stationery store and bought a pen and a notebook. Each pen was 8.53 yuan and each notebook was 5.87 yuan. He paid the salesperson 20 yuan. How much should he get back?
小强去文具店买了一支钢笔和一本笔记本，钢笔每支8.53元，笔记本每本5.87元，他付给营业员20元，应找回多少钱？
<gadget id="calculator">8.53 + 5.87</gadget>
<output>14.4</output>

<gadget id="calculator">20 - 14.4</gadget>
<output>5.6</output>

<result>5.6</result>