There are 10 bags of soybeans in the tofu shop, each bag is 50 kg. 1 kg of soybeans is used to make 4 kg of tofu. How many kilograms of tofu can be made from these soybeans?
豆腐店有10袋黄豆，每袋50千克．1千克黄豆做4千克豆腐．这些黄豆能做多少千克豆腐？
<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">4 * 500</gadget>
<output>2_000</output>

<result>2_000</result>