Mr. Wang spent 27.89 yuan on math reference books and 37.25 yuan on teaching aids. He paid the salesperson 100 yuan. How much should he get back?
王老师买数学参考书用了27.89元，买教具用了37.25元，他付给售货员100元，应找回多少钱？
<gadget id="calculator">100 - 27.89 - 37.25</gadget>
<output>34.86</output>

<result>34.86</result>