A ball falls freely from a height of 100 meters, jumps back to half its original height each time it hits the ground and falls again, how long does it travel when it hits the ground for the third time?
一个球从100米的高处自由落下，每次着地后又跳回原来高度的一半又落下，当它第三次着地时，它共经过多少路程？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">100 + 100 + 50</gadget>
<output>250</output>

<result>250</result>