Uncle Zhang cultivated turf on a piece of trapezoidal land with an upper bottom of 4 meters, a lower bottom of 16 meters and a height of 10 meters. If the turf is sold for 18 yuan per square meter. How much can the turf cultivated on this land be sold for?
张大伯在一块上底4米、下底16米、高10米的梯形土地培育草皮．如果每平方米草皮卖18元．这块地培育出的草皮可卖多少元？
<gadget id="calculator">4 + 16</gadget>
<output>20</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">20 * 5 * 18</gadget>
<output>1_800</output>

<result>1_800</result>