A suit is 420 yuan, and a shirt is 80 yuan. How much will it cost to buy 20 suits and 20 shirts?
一套西服420元，一件衬衫80元，买20套西服和20件衬衫一共要花多少钱？
<gadget id="calculator">420 + 80</gadget>
<output>500</output>

<gadget id="calculator">500 * 20</gadget>
<output>10_000</output>

<result>10_000</result>