Desertification is increasingly endangering the living environment of human beings. The arable land area in the world is only about 14 million square kilometers, while the desert area is more than twice the arable land area of 08 million square kilometers. How many billion square kilometers is the desert area in the world?
土地荒漠化日益危害人类的生存环境．全世界可耕地面积大约只有0.14亿平方千米，而荒漠面积比可耕地面积的2倍还多0.08亿平方千米．全世界荒漠面积约有多少亿平方千米？
<gadget id="calculator">0.14 * 2</gadget>
<output>0.28</output>

<gadget id="calculator">0.28 + 0.08</gadget>
<output>0.36</output>

<result>0.36</result>