A ball falls freely from a height of 80 meters. Each time it hits the ground, the height of its bounce is 30% of the height of the previous drop. What is the height of the second bounce of the ball?
一个皮球从80米的高空自由下落，每次接触地面弹起的高度是前一次下落高度的30%，这个皮球第二次弹起的高度是多少米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">80 * (3/10) * (3/10)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>