Teacher Wang bought two story books, the prices were 3.86 yuan and 7.28 yuan respectively. She paid the salesperson 15 yuan. How much should she find?
王老师买了2本故事书，价格分别是3.86元、7.28元，她付给售货员15元，应找会多少元
<gadget id="calculator">15 - 3.86 - 7.28</gadget>
<output>3.86</output>

<result>3.86</result>