The base of a red flag is 50 cm, and the height is 20 cm. How much red paper is needed to make 120 such red flags?
一面红旗的底是50厘米，高是20厘米，做120面这样的红旗，至少需要多少红纸？
<gadget id="calculator">50 * 20 * 120</gadget>
<output>120_000</output>

<result>120_000</result>