Qinghe School bought 50 sets of performance costumes to celebrate the "18th National Congress", which cost 7,200 yuan, 80 yuan for each jacket, and how much for each pair of trousers?
清河学校购买庆祝"十八大"演出服50套，共用了7200元，每件上衣80元，每条裤子多少钱？
<gadget id="calculator">50 * 80</gadget>
<output>4_000</output>

<gadget id="calculator">7_200 - 4_000</gadget>
<output>3_200</output>

<gadget id="calculator">3_200 / 50</gadget>
<output>64</output>

<result>64</result>