A ball falls freely from a high place, and each time it hits the ground, the height of its bounce is (2/5) the height of the previous drop. If it is dropped from a height of 100 meters, how many meters does it bounce off the third time?
一只球从高处自由落下，每次接触地面后弹起的高度是前一次落下高度的(2/5)．如果从100米的高度落下，那么第三次弹起多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 * (2/5) * (2/5) * (2/5)</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>