The school bought 25 pairs of badminton rackets and 25 shuttlecocks. Each pair of badminton rackets is 18 yuan, and each shuttlecock is 2 yuan. How much did you spend on these sporting goods?
学校买了25副羽毛球拍和25个羽毛球，每副羽毛球拍18元，每个羽毛球2元，买这些体育用品共花了多少元？
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 25</gadget>
<output>500</output>

<result>500</result>