The fifth grade students collected 128 kilograms of tree species, the sixth grade students collected only the fifth grade (11/8), the fourth grade students collected only half of the sixth grade students, how many kilograms of the fourth grade students collected tree species?
五年级同学采集树种128千克，六年级同学采集的是五年级的(11/8)，四年级同学采集的只有六年级的一半，四年级同学采集树种多少千克？
<gadget id="calculator">11 / 8</gadget>
<output>11/8 = around 1.375</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">128 * (11/8) * (1/2)</gadget>
<output>88</output>

<result>88</result>