A calculator is 16 yuan. Teacher Wang bought 6 and paid the salesperson 100 yuan. How much should I get back?
一个计算器16元，王老师买了6个，付给售货员100元，应找回多少钱？
<gadget id="calculator">16 * 6</gadget>
<output>96</output>

<gadget id="calculator">100 - 96</gadget>
<output>4</output>

<result>4</result>