There are 135 apple trees in the orchard of Uncle Wang’s family, and each tree produces an average of 52 kilograms of apples. How many kilograms of apples can these trees produce in a year?
王大爷家的果园里有135棵苹果树，平均每棵树产52千克苹果，这些树一年可产苹果多少千克？
<gadget id="calculator">52 * 135</gadget>
<output>7_020</output>

<result>7_020</result>