new greenhouse was built on the farm, with an area of 280 square meters, and all tomatoes were planted, with an average yield of 5 kg of tomatoes per square meter. It can be calculated at 3.40 yuan per kilogram. Please ask a two-step calculation problem and answer it.
农场新建全部一座温室，面积时280平方米，全部栽西红柿，平均每平方米产5千克西红柿．每千克按照能卖3.40元计算．请提一个两步计算的问题，并解答．
<gadget id="calculator">5 * 280</gadget>
<output>1_400</output>

<gadget id="calculator">3.4 * 1_400</gadget>
<output>4_760</output>

<result>4_760</result>