On the eve of June 1st, the Young Pioneers Brigade assigned the task of making toys for kindergartens to the fifth and fourth grades on a 5:3 basis. The fifth grade actually made 108 pieces, exceeding 20% of the assigned tasks. How many toys did the fourth grade originally plan to make?
六一前夕，少先队大队部把为幼儿园做玩具的任务按5：3分给五年级和四年级，五年级实际做了108件，超过分配任务的20%．四年级原计划做玩具多少件？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">108 / (6/5) / 5</gadget>
<output>18</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>