To make a square carpet with a side length of 5 meters, it costs 16 yuan per square meter. How much does it cost to make this rug?
做一个边长为5米的正方形地毯，每平方米需要16元．做这个地毯需耍多少钱？
<gadget id="calculator">5 * 5 * 16</gadget>
<output>400</output>

<result>400</result>