Fold a piece of paper with a thickness of 0.1 mm in half, and fold it in half again. After folding this way 4 times, what is the thickness of the paper in mm?
将厚0.1毫米的一张纸对折，再对折，这样折4次后，这张纸厚多少毫米．
<gadget id="calculator">2 ** 4</gadget>
<output>16</output>

<gadget id="calculator">0.1 * 16</gadget>
<output>1.6</output>

<result>1.6</result>