The price of badminton rackets in the store is 105 yuan per pair. Teacher Zhang bought 6 pairs of badminton rackets, and the salesperson returned 80 yuan. How much did Teacher Zhang pay the salesperson?
商店里的羽毛球拍，每副售价是105元，张老师买了6副羽毛球拍，营业员找回80元，张老师付给营业员多少元？
<gadget id="calculator">105 * 6</gadget>
<output>630</output>

<gadget id="calculator">630 - 80</gadget>
<output>550</output>

<result>550</result>